look up any word:
3. Butt Knuckle
When a male wears his pants/shorts extra tight and his balls are showing. The opposite of Camel Toe.
Check out the Butt Knuckle on that guy!!!
by Skinnywalker Jan 13, 2005 add a video
1. butt knuckle
(noun) The popping sound made by an explosive fart. A crisp and short passage of gas from ones butt.
Excuse me while I crack my butt knuckle.
2. butt knuckle
tailbone
I fell off my board and smashed my butt knuckle
rss and gcal