2 definition by Mister Meat

1) When a man and woman engage in sexual intercourse, generally in a dog-like position (doggy style), the man, while laying the bone, proceeds to insert his index and middle finger into said womans anus. Upon the removal of the fingers, the man proceeds to whipe the fecal residue on the womans upper lip. The look of the woman is one of utter disgust, resulting in her looking like a dirty mexican named Sanchez. Hence, the name Dirty Sanchez
2) A disgustingly unkempt moustache, that actually looks like it's made of shit.

DISCLAIMER: IF YOU ATTEMPT THIS, THE SHIT MAY BURN HER LIP. USE EXTREME CAUTION.

Pronounced (Fill-Thee-Rah-Mown)
noun, verb: The Distant cousin of the Dirty Sanchez. Ramone takes pride in using his cock to make the moustache rather than the index finger of said man. Thus the act includes: Laying the bone anally, and proceeding to remove said man's penis from said woman's asshole, and whiping the fecal matter on said womans upper lip. This creates a dirty shit moustache similar, but far more severe than that of the Dirty Sanchez. Use extreme caution when performing. That shit stannngggsss.