B) A code word used by collegiates (or anyone sharing a room) to notify his/her roommate that he/she is getting laid.
Verbally it is spoken to get the roommate out of the room to engage in sexual activity or Written on a sticky note and put on the door to
avoid a walk in.
B): Joe put a sticky note with "Pineapples" written on it so his roommate wouldn't walk in on him banging Jen.
Joe: I need the room tonight.
Tim: Ah. The room's yours.