When someone fills another's bum with sun tan lotion and then proceeds to have anal sex with them and moves such an alarming rate that it causes the receiver's rectum to become tan from the glowing heat of the giver's penis.
"Damn it!" - Male 1
"What?" - Male 2
"I need some sun tan lotion so I can give my wife a sun worm!" - male 1
"holy crap that is gross." male -