a.) When a woman masturbates during overt menstruation (during her period), then wipes the remnants (consisting of blood and other female fluids) on her partners upper lip.
b.) A female inserts her fingers into her vagina during overt menstruation, then wipes the blood on her partners upper lip.
When you wipe a booger on someone without them knowing it, that's called a "Dirty Mark Sanchez."
Did you see New York Jet's quarterback Mark Sanchez wipe a booger on back-up quarterback Mark Brunell during the AFC Conference Game? That's what I call a "Dirty Mark Sanchez."
An Irish version of the Dirty Sanchez where after doing a chick on the rag, you wipe your member over her upper lip giving her a red mustache. Somewhat ironic considering that sex during menstruation makes pregnancy highly unlikely and the Irish are notorious for their high fecundity.
Paddy: I got me hole last noight.
Connor: Who wit?
Paddy: Dat loosebit Shandie O’Flaherty. An’ wile she was bleedin’ out her feckin’ gee!
Connor: Jaysus Chroist!
Paddy: An’ efterwards, I woiped me langer ‘cross her face an’ gave’er the ol’ Dirty Seanchez!