Top definition
a very untidy vagina; when one does not clean their vagina
Guy 1: Dude I could not go down on her.

Guy 2: Why not?
Guy 1: She has a brown taco.
by Johnny Five-O September 14, 2011
Happy St. Patties Day!
A female asshole resembles a taco turned 90 degrees and colored brown. The opposite of a Pink Taco only referring to a females asshole.
She has a very nice brown taco, it was warm and tight.
by SickAsHell September 27, 2005
Happy St. Patties Day!
Taking a turd, laying it in a woman's vulva, then eating it.
"Don't mind my breath, I've been eating brown taco!"
by D. Finer November 28, 2006
Happy St. Patties Day!
When a man takes a shit in a chicks twatter.
did you see the long lost princess diana sex tape? the prince shits right in her roast beef... brown taco.
by Lifter5 January 05, 2008
Happy St. Patties Day!