n. The friend one brings to a social function whose purpose it is to dissuade the unwanted sexual advances of a third party butterface one would prefer not to allow oneself to engage in sexual congress with.
n. A third wheel invited to put a damper on opportunistic, but regrettable, sex-having
Dude, that nasty slute Gretta wants to meet me at the rave, and if you're not there as my rapebuffer, I'll probably let her suck it.