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1.
Who you make your booty calls to. A friend with benefits.
"Last night, Becky called at 2 am and asked me to come over. I guess I am now her official bang buddy."
by janetfromanotherplanet December 08, 2009
 
2.
a best friend or a booty call; buddy with benefits.
All my bang buddies are my best friends, we like to bang!

Girl: Hey
Boy: Supp?
Girl: Did your girlfriend tell you she's my bang buddy?
Boy: Whaaaa!?
Girl: Jus' sayin.
by esmeralduh June 24, 2011