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1.
Basically the revers dirty sanchez is the same as a regular dirty sanchez, the only difference being that the female enters the males anus with her fingers and wipes them accross his upper lip resuling in an authentic looking moustach.
"I went for the dirty sanchez on sandra last night but she countered and hit me with the reverse dirty sanchez"
by Billybobfulton July 16, 2006
 
2.
When you perform analingus on a girl who has dingleberries. You end up with a reverse dirty sanchez.
I munched on that batty and ended up with a reverse dirty sanchez bro.
by SMSL July 21, 2008