Top Definition
Back-Alley Blowjob.

This term is used to describe the location in which two secretive (or not entirely open) lovers may have disappeared to from any public setting/location. Although the definition is not meant to be literal, it is meant to suggest sexual bonds between the two lovers in question.
Dude 1: "Hey man, have you seen Bob?"
Dude 2: "Yeah, actually I just saw him with Karen a second ago... not sure where they are now."
Dude 1: "Oh! You know what that means: BABJ! I knew they were seeing each other!"
by mstra69 April 08, 2009

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