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Short for 'killed it'. The word was popularized by judge Shane Sparks on America's Best Dance Crew when describing a good performance.

It is often seen preceding the word 'y'all' in a sentance.
Shane Sparks: "Man, that dance was crazy. Y'all Kilt'it tonight. What did you think lil' mama?"
by TonkaTruck February 26, 2009
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