This isn't funny unless you know about chewing tobacco...
...and about working-class laborers' love for the stuff in America. But hell, long-haul lorry drivers in the UK probably chew the stuff too. This was the most surreal dirty joke we knew at our school, so I'll pass it around to you.

These two long-haulers are tearing along a rural stretch of motorway in an 18-wheeler lorry when one of them realizes that he shouldn't have skipped the last rest stop - he is in DIRE need of a place to stop and defecate. Unfortunately, they're running behind schedule, and it was for that very reason they didn't stop.

The afflicted passenger turns to the driver and explains the situation. The driver says: "Just roll down your window and stick your arse out."

"But there's houses out there!" the passenger complains

"You think they can see you from so far off the road? Look, we're the only ones out here, so just shit out the window and we'll keep going."

So the passenger does it, cramming his hairy arse out the window sideways in order to fit it... whilst an old couple, true to his worst fears, watches from their back porch.

"God!" says the woman. "Did you see the size of the tobacco chaw that lorry driver spat out?"

"That was nothing," says her husband. "Did you see the size of his fucking *lips?*"
(Dr.Whogivesaratsarse, Fri 10 Sep 2004, 6:37, Reply)