humping and crying

A line in the Clint Eastwood movie High Plains Drifter.
The outlaw comes back to town to claim his girlfriend and get
even with the town for having to go to jail. When he learns his
girlfriend had a new bed partner during his absence he confronts her. She claims to have been true and crying for him.
He comes back with "Yeah you were crying, lieing in his bed humping and crying, humping and a crying."

Bob: "Dude I heard you've been banging Dave's girl while he's been gone!"
Sam: "Yeah she still misses him, she lays in my bed humping and crying."