Usually refers to a situation where a male is "doing" a female from behind at the top of a flight of stairs. Just before ejaculating, he pushes his partner's arms out from under her, and rides her down the stairs.
A good way to get out of a bad relationship.
Man, I was doing Julie at the top of the stairs last night, and I suddenly decided to snowmobile her. It was pretty sweet.
An off-road vehicle (OAV) designed and intended for use upon snow in regions which get substantial amounts of snowfall They have one safety mechanism and almost anyone can learn to drive one, supposing he is
a) over the age of 14 and
b) he has both hands
a willing girl or guy is fucked doggy style while being steered head-first on hands/arms down a flight of carpeted stairs. using-a-female-receiver "bonus": grab boobs for steering.
I agreed to to let my boyfriend snowmobile me because I got it confused with snowballing. Instead, I'm being fucked down the stairs. / I was snowmobiling this chick last night and it gave us both rugburn. Next time, we're wearing kneepads.