A term made up by the 'Diary of a Wimpy Kid' used asa 'Your Mom' joke.
Substitute teacher: Greg, can you answer this problem?
Greg: Your Mama!
Subsitute tecaher: Excuse Me?
Greg: Your Big Fanny Granny!
Subsititute Teacher: Well I hardly think that's -
Greg: Your Slaphappy Grandpappy!
by middle_school_'lOsEr' December 30, 2009
4 Words related to Your Slaphappy Grandpappy

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