NO, a Dirty Sanchez is performed when a male fingers a female's ass and wipes the reminants on the female's upper lip. What you referred to below, when a male inserts his penis in a female's ass then transfers the fecal matter from his penis to the female's upper lip is the Dirty Rodruigez, the first cousin of the Dirty Sanchez. Don't feel bad though, they are commonly confused.

The man's index finger was smelly after administering a dirty sanchez.
by nickel poo turnip September 27, 2006
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Ok, this is the official way to give a dirty sanchez people, get it straight. First you must be doing a girl doggy-style, then you stick a finger in her asshole, and reach around to administer the poo-stache.
I told the bitch I'd give her a Dirty Sanchez if she wouldnt shut her trap.
by mengele January 21, 2007
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ALL OF YOU ARE WRONG!!! It's when a girl is on her period and a guy takes the tampon out with his teeth, then shakes it back and forth leaving two red stripes.
Girl: Hey baby, do you want a dirty sanchez?
Boy: Hell no, you dirty ass cunt!!!
by Shannon May 13, 2005
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The etymological history of the term "Dirty Sanchez" originated with one Generalissimo Leopoldo Sanchez, who led the infamous and ill-fated raid on the Panoche Grande brothel in 1848. Mistakenly believing he was counter-attacking to fend off an American incursion, he resigned himself to a life of tequila and debauchery in the alleys of Juarez. He was known for sporting a excrement mustache and a large silver-toothed smile.
by Timone Sanchez January 25, 2008
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A time honored event in which, while laying the bone doggy-style, you insert two fingers deep into the girl’s starfish. Pull it out, then reach around and wipe the residue across her upper lip, leaving her a thin, shit mustache. Making her resemble someone who would be called Dirty Sanchez.
Last night, after leaving the bar, I met this lil slut outside and dirty sanchez'd her in the back of the limo.
by PoloSportCondoms.com June 7, 2005
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The act of engaging in the doggy style position then fingering the female's anus while in that position and smearing a residue of her own shit accross her upper lip forming a mustache.
I would never kiss my girl right after a dirty sanchez!!!
by lanyc July 30, 2006
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A dirty sanchez:
(1) what everyone else said apart from that noob who was jizzing in someones mouth.

(2) a truly awsome (or disgusting) show on MTV alot like jackass but so much better as the welsh acent makes it even funnier and they are so much more crazy they should have been commited.
(1). me: "dude i should my finger in this girls ass when i was pounding her doggy style lastnight an then wiped it on her lip."
Rob: "oh dude u gave her a dirty sanchez? thats wrong mate"

(2) "you live on the bus you get fucked up on the bus."
"this isn't fucking gay school ya know!!"
by hazmat man August 1, 2006
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