When two people are engaged in sex, one person, usually the male, inserts their finger in the anal cavity of their partner, and proceeds to wipe particles of feces on the upper lip of their mate.
My girlfriend and I were having sex last night, and right after I had an orgasm I gave her a dirty sanchez.
by Pete March 21, 2003
When your getting some brown lovin' and you smear some shit on your lovers lip making her look like shes got a brown mustache.
by BlueOyster April 30, 2003