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When you're so messed up on laughter that you can't stop cackling while doing something stupid like chewing bubble gum in math class.
I was doing gadyfun during the test and got a 23% because I was too busy laughing at my own dumbness.
He was doing gadyfun while trying to fix the printer and ended up making it explode.
She was doing gadyfun during the principal's speech and got sent to the office for laughing too hard.