When you finally find an empty public restroom for a dump so massive that it requires complete solitude for the deposit....and then someone walks in.(especially at your office/work place)
Just as I was about to 'release the beast', some turd buglar entered the bathroom causing my sphincter to snap shut!
A homosexual poacher of human feces; a poo-pilferer. Allternately, a rectum-robber who has a penchant for feces during gay sex.
"Hey, buddy - quit eyeing by bunghole like that! Whaddaya, some sort of TURD-BURGLAR??? Does this looklike a fucking bathhouse? There's no sphincter pudding here for you!"