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Dirty Sanchez is a purported sex act where feces is purposely smeared onto a partner's upper lip. Sex-advice columnist Dan Savage says the act is completely fictional.  Brian Bouldrey in Dirty Words: A Literary Encyclopedia of Sex says the act is an urban legend.  The New Partridge Dictionary of Slang and Unconventional English says, "This appears to have been contrived with the intention to provoke shock rather than actually as a practice, although, no doubt, some have or will experiment." 
Columnist Gustavo Arellano of ¡Ask a Mexican! contends the term evokes the stereotypical mustache of a Mexican.  The term for the sex act entered British gay cant Polari in the 1960s. 
American heavy metal band Steel Panther mentioned Dirty Sanchez in their song titled "The Shocker" from the 2009 Feel the Steel album. Another band Sleazy RoXxX recorded song called "Dirty Sanchez" as their 2016 album Topless Suicide opener.