Top Definition
A sexual act in which two men have oral and vaginal/anal sex with a woman who is on all fours while eating a plate of nachos (can be as simple as chips and cheese) off of her back.

While this act could be performed using a variety of other foods, it would no longer be a Nacho Bar.
Person A: So my roommate and I brought this girl home from the bar last night and did a Nacho Bar.
Person B: A what?
by Memetic February 23, 2009
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