A Cock Sleeve is typically a Gay man or straight female who enjoys being used for sexual pleasure so much to the point where they are more then just your common whore
1: Yooo did you see jenny last night?
2: no why?
1: bro she was being treated like a Cock Sleeve
1. Don't listen to that cock-sleeve Simon Belmont, it's not like I chose to work for Dracula!
2. The definition above me is wrong, and was written by a total cock-sleeve.