moon taco Share definition Flag When a girl moons you and she pulls her pants down a little too far and you not only see her butt, but you also see her cooch. Stephanie tried to moon this guy when she was drunk but he ended up seeing her moon taco. moon taco by rythsm January 9, 2010 0 0 Get merch Get the moon taco mug. Buy Now — $32.95 See more merch