"The Cop and the Speeder" joke

A young guy is speeding across a bridge in his fancy sports car.
Sure enough, a cop with a radar gun is sitting on the other side
of the bridge. The cop pulls him over, then walks up to the
guy's car and asks, "What's the hurry?"

The guy replies, "I'm late for work, officer." "What do you do?"

"Well, I'm a rectumstretcher." "What? A rectum stretcher?"

The guy explains, "Yeah. I start with a finger, then work my way up to two fingers... eventually I get a hand in, then both hands, and I slowly stretch it until it's about six feet wide."

The curious cop asks, "What do you do with a six-foot asshole?"

The guy answers, "Well, you give him a radar gun and park him at the end of a bridge."