A bilabial fricative is a phone whose place of articulation

Place of articulation

In articulatory phonetics, the place of articulation of a consonant is the point of contact where an obstruction occurs in the vocal tract between an articulatory gesture, an active articulator , and a passive location...

 is bilabial (with both lips) and whose manner of articulation

Manner of articulation

In linguistics, manner of articulation describes how the tongue, lips, jaw, and other speech organs are involved in making a sound. Often the concept is only used for the production of consonants, even though the movement of the articulars will also greatly alter the resonant properties of the...

 is fricative.

There are two bilabial fricatives, neither of which appears in standard English. The voiced bilabial fricative

Voiced bilabial fricative

-See also:* List of phonetics topics...

 (IPA

International Phonetic Alphabet

The International Phonetic Alphabet "The acronym 'IPA' strictly refers [...] to the 'International Phonetic Association'. But it is now such a common practice to use the acronym also to refer to the alphabet itself that resistance seems pedantic...

: [β]) is a sound similar to English v, but with the air going between the lips. It is used for the Spanish

Spanish language

Spanish , also known as Castilian , is a Romance language in the Ibero-Romance group that evolved from several languages and dialects in central-northern Iberia around the 9th century and gradually spread with the expansion of the Kingdom of Castile into central and southern Iberia during the...

 letters b and v, as well as in other languages. The voiceless bilabial fricative

Voiceless bilabial fricative

-See also:* List of phonetics topics...

 (IPA: [ɸ]) is a sound similar to English f, but also made between the lips. It appears in the Japanese

Japanese language

is a language spoken by over 130 million people in Japan and in Japanese emigrant communities. It is a member of the Japonic language family, which has a number of proposed relationships with other languages, none of which has gained wide acceptance among historical linguists .Japanese is an...

 sound romanized

Romanization

In linguistics, romanization or latinization is the representation of a written word or spoken speech with the Roman script, or a system for doing so, where the original word or language uses a different writing system . Methods of romanization include transliteration, for representing written...

 as f or h, as well as in other languages. The two sounds, as well as the two labiodental fricatives, are used contrastively in Ewe

Ewe language

Ewe is a Niger–Congo language spoken in Ghana, Togo and Benin by approximately six million people. Ewe is part of a cluster of related languages commonly called Gbe, spoken in southeastern Ghana, Togo, and parts of Benin. Other Gbe languages include Fon, Gen, Phla Phera, and Aja...

.

George Carlin

George Carlin

George Denis Patrick Carlin was an American stand-up comedian, social critic, actor and author, who won five Grammy Awards for his comedy albums....

 incorrectly used the phrase bilabial fricative to refer to the sound of blowing a raspberry

Blowing a raspberry

Blowing a raspberry or strawberry or making a Bronx cheer is to make a noise signifying derision, real or feigned. It is made by placing the tongue between the lips and blowing, making a sound redolent of flatulence. In the terminology of phonetics, this sound can be described as an unvoiced...

, which is correctly called a linguolabial

Linguolabial consonant

Linguolabials or apicolabials are consonants articulated by placing the tongue tip or blade against the upper lip, which is drawn downward to meet the tongue. They represent one extreme of a coronal articulatory continuum which extends from linguolabial to subapical palatal places of articulation...

 trill

Trill consonant

In phonetics, a trill is a consonantal sound produced by vibrations between the articulator and the place of articulation. Standard Spanish <rr> as in perro is an alveolar trill, while in Parisian French it is almost always uvular....

 (except as performed by chimpanzees).

Jack Black

Jack Black

Jack Black , is an American actor and musician, notably of Tenacious D.Jack Black may also refer to:* Jack Black , late 19th - early 20th Century author and hobo* Jack Black , drummer for 1970s UK punk band The Boys...

 also incorrectly used the phrase bilabial fricative in the special features of the Tenacious D

Tenacious D

Tenacious D is an American rock band that was formed in Los Angeles, California in 1994. Composed of lead vocalist and guitarist Jack Black and lead guitarist and vocalist Kyle Gass, the band has released two albums – Tenacious D and The Pick of Destiny...

 in The Pick of Destiny DVD. He was actually referring to a voiced bilabial trill

Bilabial trill

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, often used as part of his vocal warm up.