When someone drops a dookie SO huge or SO hard that it clogs the shitter - even multiple flushes won't "budge the fudge".
Joey ate so much pizza that he left a bowl-buster in there ! I'm gonna need a plunger and two pounds of C-4 to get that mutthafukka outta there !
a much larger than normal bowel movement
Man, I must have lost 10 pounds after that bowlbuster!
A massive dump that, with its girth, breaks the toilet bowl.
"John, What are you doing?"
" I have to replace the fucking toilet. Amanda had Indian food last night and laid out a real Bowl Buster."