2 males that enjoy anul sex and repeat this proces as an occasional social interaction

may be used as an insult or a verb.
Cool people: Jesus Steven and Diddy are right bum buddies.

Steven: hey diddy , wanna be bum buddies?
by Dom and matt April 07, 2006
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A bum buddy is a best friend that you always hang out with.
Hey Mia is Gracie's BumBuddy
by Kinky124 March 25, 2019
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Two or more males taking part in gay anal sex and always with each other.
Frank and liam are bum buddies they like to have gay sex and are always with each other.
by charlie8764 April 07, 2011
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