Penis, but usually used with "Riding" when you are having to bend over and take it - like an impossible and painful situation you can't get out of.
My boss has me riding the skin bus on this project.
3👍 2👎
to masterbate at great speed
'I woke up this morning and took a white knuckle ride on the skin bus'
12👍 10👎
Penetrative hetrosexual sex.
Man, Tonights going to be be great. I am going to drive the pig skin bus to Tuna Town with Angela.
21👍 9👎