Noun

1. An ox-like mammal native to the Himalayas and Tibet with dark, long and silky hair a horse like tail and a full, bushy mane.

Verb

1. To talk, particularly informally but persistently, such as chatter.
2. To vomit, usually as a result of excessive alcohol consumption.

Usage notes

• This is subject to the typically Australian 'have-a-verb' syntactic construction, as in 'I had a yak last night'. But this does not qualify 'yak' to be nominal.

Noun

1. A talk, particular an informal one such as chattering.
2. A laugh
3. Vomit.