Your Big Fanny Granny

Term used by 'Diary of a Wimpy Kid' as a 'your mom' joke.

Substitute Teacher: Greg, can you answer this problem?
Greg: Your Mama!
Substitute Teacher: Excuse Me?
Greg: Your Big Fanny Granny!
Substitute Teacher: Well I hardly think that's -
Greg: Your Slaphappy Grandpappy!

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