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An onomatepoeic word for hitting someone lightly, to "kerpoof" someone. Mostly used in play fighting, or in an affectionate manner, although occasionally to be used to "teach someone a lesson"
Chris: "hey! What was that for?"
Emily: "what?"
Chris: "You kerpoofed me in the nose!"

Son: "Shut up!"
Dad: "Watch your tongue boy, before I kerpoof you!"
by Dynam0hh August 12, 2012