When two bro's (usually frat boys) reach between their legs to give bumps. Bibye bumps are usually reserved for saying farewell to your most intimate of bros. Bibye bumps can be done back to back, front to front, or back to front.
Yo bro, have fun at Mtv spring break. Now give me a Bibye bump.
by Norwegian Mike February 05, 2009
Can you define these popular missing words?