shuttle bus 

When the middle person in a spit roast provides the necessary motion or is jostled back and forward.
Also an ozbargain inside joke.

Is this a free shuttle bus or a free “shuttle bus”?

shuttle bus by Peter Peterson Petersen August 31, 2018

Irish Shuttle Bus 

Paddy wagon

Seamus took the Irish Shuttle Bus home from the pub. We'll bail him out in the morning.

Irish Shuttle Bus by Middagh March 28, 2015

shittle buse 

A very shit shuttle bus, normally used as a replacement for subways or overground trains.

Hillary : Had to take the shittle buse to work again today!
Stefan: Fuck

shittle buse by LonNyc December 8, 2011

shuttlebus 

The incursion of the thumb ...forcefully into the anus!!!!

Damn dude I was with that girl last night!!!!
..did you hit her with that shuttlebus....
Shiiiiit!!! You know I did!!!

shuttlebus by thebullis September 4, 2015