Similar to a Dirty Sanchez but more frank. This maneuver is performed as a post-coitus display of disrespect for a man's partner. The male subject subdues his partner and proceeds to smear his sweaty buttcrack over her nose and ride up and down her face with it. Optional: to make it more enjoyable for her, tickle her nostrils with your asshair/dingleberries.
"After Mark had forgotten to wipe his ass, Sydney received a crusty, stale brown smar."

"During a football game, Steve's pants were yanked loose. After the play, Steve vented his frustration by pulling a brown smar on the fallen defender."
by Steve Bright October 20, 2003
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