1).A turd comprised with chunks of undigested food such as corn
2).Multiple turds from different donors stuck together, usually found in port-o-pottys and gas-station restrooms
"After eating that corn today, next time i shit there's gonna be a huge turd mongrel in the toilet"
A person who refuses to acclimate to the environment and proceeds to assume turd formation with persistence.
Don't mind Bob, he's being a real big turd mongrel tonight because I wouldn't stop at Mickey D's.