Top definition
inserting one's finger deep into their anus, then proceeding to wipe it on an unsuspecting victims top lip.
whilst fingering his ringer, colin knew that it was time to get his aunty with the 'shit-moustache'

the filth monger got me with the shit-moustache
by brewlio April 29, 2007
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2
A shit moustache is the process of wiping ones finger between their sweaty ass cheeks and rubbing quickly and precisly under the moustache area
Before the stupid prick realised i had landed a beauty of a shit moustache right on his chops
mmmmmm finger licking good!!!!!
by Bread stick April 19, 2007
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