a cumsloth 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!!!
A man who needs to cum constantly or becomes ornery, like a cow who has not been milked and has swollen udders. He requires daily "milking" to stay normal, or is at risk of going into a frenzied whiteout.
-Why is Neal whimpering and moaning at us?
-He's a cumcow, and hasn't ejaculated in the past 4 hours. He just needs to be milked.
-Too bad he has zero game. This could go on for weeks.