moon taco
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.
Taco Moon Pie
When a person with female genitalia bends over and rips their pants and all the business shows. See also: sausage moon pie (male genitalia)
Ugh! I was so embarrassed when I had my tights pants on and gave everyone a taco moon pie when I dropped my pen.