"cuddle butt pump" - the act of subconsciously thrusting your hips during spooning
. It occurs in the small window of time between awake and sleep and usually involves the guy (the person about to perform CBP) spooning the girl (about to get thrusted upon) during a home movie or the like. It is typically a subtle act, and the girl usually rolls her eyes at the thought, while guys laugh at the prospect.
CBPing, CBPed, CBPs
And so, halfway through The Notebook, he started to CBP me and I knew he wasn't awake!