Analcreeper

when you creep up behind someone and when they aren't looking take whatever you have in your hand (whatever object) and shuv it as far in as possible.

I was walking through the hall today trying to get to class and suddenly I feel this big object slowly going up my ass. I turn around and see some random jock with his waterbottle in his hand coming from my ass laughing. He told me I just got analcreeped and he was the analcreeper