Under anal intercourse, put your finger up her anus, then draw your finger over her upper lip, giving her a brown stripe resembling a mexican revolutionist mustache. Thus "Dirty Sanches"
Similar to a dirty sanches, but it must occur in San Ysidro which is a prominent US/Mexico boarder crossing. A person in the US climbs the fence and takes a crap on the whore on the other side and then throws a few dollars down to the other side.
this chick was giving me head and my friend was boning her in the ass as i was cuming i hit here over the head and nutt came out here nose my friend came to and shuved his fingers in her ass and wiped the same finger on here upper lip. damn thats hard to give an example for.