look up any word, like donkey punch:
 
2.
1) when one dude "accidently" bumps his rump in the groin of his bro.
2) a mathematical formula for sex, not involving pie.
2) Wayne (turning to his bro) "Good, she's gone...bro bump?"
by lucifern March 17, 2007
 
1.
Bumping fists together as a greeting.
I greeted my homie with a BRO BUMP.
by CaptBadass November 07, 2006