Verb

1. To strike or collide with something.
2. To have sexual intercourse (also spelled as to boink).
3. To hit something with the front wheels of the skateboard, whilst in the air, this pre-dates the snowboarding term,
4. : To hit something (especially a tree) with one's snowboard, especially while in the air.

Noun

1. A bump on the head.
2. Any minor collision or random meeting.
3. An act of sexual intercourse.