Top Definition
"Okay, have fun."

except it's generally used in a more dismissive sense as most kind people tend not to condense "have fun" into just two letters unless they're driving, in which case they're douchebags for texting while driving.
Jane: "Fuck you. Don't bother calling me back!"
Alex: "khf"
by AnAnonymousThrowawayAccount July 31, 2011

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