Descending into a self-indulgent vacuous state of existence, shafting all your friends drugs into your anus (caving), delaying their high, for your own personal gain.
He said he'd be here like 2 hours ago! He's Scott Cavingall over our lives...
when a boy/girl (usually used for a boy) goes off to a dark room to talk on the phone with thier girlfriend/boyfriend when they are supposed to be hanging out with thier friends.
bobby:"hey, where did joey go?"
mike:"oh hes bat cavingup in his room"