To paint one's penis green and then put cookies in their grandmas ass, and then put the penis in the ass.
Her: How was the family reunion?
Him: It was a total Green Penis Grandma Cookie!
Her: Holy FUCK!!
by Professional Educator September 22, 2020
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Alongside the likes of "ur mom gay" and "ur dad lesbian", "ur grandma have penis" is a phrase that can be used to absolutely D E C I M A T E someone in an argument
Gay kid 1: I fucking hate you and ur dad lesbian
Retarded child numero dos: lol ur grandma have penis
gay kid 1: SNHPye8U(JWDOMINHUB*YH*_UE)(IJNWHUSD&C)(IJHOISHU)IUHEF)*YDSA*YHF)syh0IEUFH
by Link6456 March 14, 2018
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