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Kackin it is when you laugh so hard you think your guts are gonna come out your nose. You might wet yourself, pass gas, or start talking nonsense. It’s like being hit by a truck full of confetti and you love it.
My uncle kacked it so bad he cried and peed his pants at the same time.
I kacked it so hard I told my dog I was gonna marry him.
She kacked it so much she turned into a human laugh tornado.