Bam and Jessica's Song

Only a jackass would stoop to crude sexual innuendo about Jessica Simpson - and that's exactly what Chris Pontius, one of Johnny Knoxville's doofy daredevil stuntmen in the upcoming "Jackass: Number Two," has done.

A source tells us Pontius has penned and recorded a crude song about how fellow Jackass Bam Margera supposedly had sex with the busty blond singer - describing a kinky form of intercourse that can't be printed in a family newspaper.

Margera was rumored to have had a fling with Simpson under the nose of her then-hubby Nick Lachey. Speculation reached the boiling point early last year when Margera's dad, Phil, blurted out that his son and Simpson had slept together. A flustered Bam admitted he'd once been in the same bed with Simpson, but insisted he fell asleep and nothing sexual happened.

Pontius did not return our call, but Simpson's flack, Rob Shuter, dismissed the sleazy song's trash talk, telling Page Six: "There's no truth to it. Bam has been using Jessica's name to get himself attention for a long time."

Source