What is Filthy Sanchez?
1.
a sexual act where one fingers one's partner's anus and then gives oneself or one's partner a mustache with the filthy finger
That Jessica's such a slut - she's given half the boys in school a filthy sanchez.
See
2.
1. the sexual act of following anal sex immediately with oral sex, which causes residual fecal matter to coagulate on the recipient's upper lip, resembling a Mexican handlebar moustache
2. Unexplained sexual position taught by
(1) 'Naw, I gave that slut Jessica a Filthy Sanchez, dude, not the other way around!'
(2) 'Ike, do you know what a "Filthy Sanchez" is?'
3.
Receiving oral sex while taking a shit on the toilet.
This slut at the taqueria follwed me into the restroom and give me a filthy sanchez.