Top Definition
the phenomenon of having excess hair on one's rear-end. Said excess hair is usually located on but not limited to the butt-cheek area. May also be located around the sphincter and thus contribute to the barking spider phenomenon.
"Eww Bobby, don't moon us, that's gross. I don't wanna see your butt-mop."
by Sid the Janitor March 26, 2008
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