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1.
Expelled fecal matter, specifically of human origin. An illtempered arrogant person. Nickname. Used as an expression of contempt.
"Go and ask Gruntcakes"
by Herman Vuurens April 06, 2006
 
2.
Synonymous to poop, crap, shit. It is the product of visiting the toilet to take a crap.
I have to go lay a grunt cake.
by Ohh lala October 03, 2007