To utterly and totally destroy the punchline of a joke so as to make it completely devoid of any sort of humerous value. Often, the act of
CantonING (the verb form) is funny, because the person who catoned the joke often is not aware they have done so.
This term comes from the town of
Canton in Central Illinois where people have a tendancy, due to life in such a provincial area, to miss
high-brow humor and explain simple jokes with what they see as...jokes.