When you are engaging in unprotected gay anal sex and a small piece of undigested material such as corn or a peanut gets lodged in your pee hole.
Tubba got his welfare check and took his boyfriend for a romantic dinner in Provincetown. Afterwards, they went back to Tubba's trailer and tossed each other's salads before Tubba got on all fours like a bitch. His boyfriend started drilling and yelped like a cocker spaniel when a piece of corn became lodged in his urethra. Tubba tried to suck it out to no avail. It was a textbook case of the Tubba Rat.