a cum sloth is one who moves only for the sake of consuming cum. he/she loves cum in their mouths 24/7
guy1: dude she wouldn't leave her dorm until i told her i wanted head, then she came over and sucked my cock for an hour.
guy2: wow, what a cum sloth!!!
by xturtlex May 09, 2005
An insult; usually applied to a slut, or a homosexual man. Meaning one who only moves to recieve cum.
Oh man, Phil's mom is such a cumsloth
by Anonymous December 03, 2002

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