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People who map the layout and notable features of rectums.
Oprah: I had one hell of a night last night. These anal cartographers kept me up all night.

Dr. Phil: Well at least they didn't write "Here be dragons" on your map...
by PolarKingBear January 02, 2010
N. One who works aboard the ship of an Ass Navigator and maps the neatherworld that is the anal sphincter.
"Ahoy, Jim! Chart that cove you magnificent anal cartographer!"
by GrizzlyClaw January 30, 2006