Noun: a person,usually older than 18 but not always, who likes someone younger, usually younger than 18 but not always.
Verb: the act of creeping on someone younger
Not the same as a pedophile, in most cases their is a small age gap between the pedocreeper and the pedocreepee
Girl A: Isn't your sister 19 and her boyfriend 17?
Girl B: Yeah, she's such a pedocreep.
Boy A: Are you going home for spring break?
Boy B: Yeah, and the high school is the same as ours. I'm about to pedocreep hardcore.