Top of the stairs
The "top of the stairs" is a sexual act in which a female (or male, depending on preference) performs fellatio on a man, poised at the top of a flight of stairs. During or directly following the act, the man proceeds to forcefully push his partner down the flight of stairs.
Dave: Hey man,Janie came over this weekend, and I gave her the 'ol top of the stairs!
Taylor: Dude that's fuckin' awesome!!!  