Similar to the Dirty Sanchez, the Dorito Sanchez is the act of eating a bag of Nacho Cheese Doritos and then smearing the cheese dust off of your fingers onto the upper lip of a nearby sleeping friend. Where upon awakening, everything will smell like cheese.
Frank: The other night when I had that party at my place Jim totally passed out, so I ate a bag of Doritos and gave him a Dorito Sanchez.
Bill: Haha, good one. That would explain why he kept saying everything smelled like cheese.
Frank: Oh man, classic.