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Small, or in some cases very large, maggot like creatures that dwell in ones nether regions (the anus(the shitter)), if one does not dry ones asshole after taking a large dump or receiving anal sex.
"I'm going fishing, please may I use some of your anal lice?"
"Did one of your anal lice just crawl on my face?"
"A-man has the most anal lice in the world"
by NicoleMcnunny August 08, 2008