hop a train
a train is when the girl gives the guy head and another guy hits it in the back (anal)
Yo man we went over to dan's out and hopped a train with his mom.
Hop off the freight train
Get off the unit of a man.
*Girl jumps on boyfriend ready for sex*
Boyfriend: “Ughhhh hop off the freight train”
Boyfriend: “Ughhhh hop off the freight train”