to have sex in the spooning position while keeping noise to a minimum, in order that the participants don't get caught. Used in situations where one would get in trouble if somebody found out they were having sex, such as a dorm room bunkbed, a friend's couch, church pews, etc. Usually done with clothes on for stealth purposes.
In the case that somebody around you does wake up, the go to move is to pretend sleep.
Person 1: Dude, my roommate just ran out of ambien and my girl's in heat, what should I do?
Person 2: Silent spoon bro.
Jenny, shut the fuck up, you're gonna wake up Killian, they call it the silent spoon for a reason.