To choke or cough in a loud obvious way to draw attention to something unbelievable, outrageous or gross.
I totally kacked at that dude Kim brought to the party.
by PyrateS August 7, 2007
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The pinnacle of all that is awesome.

Not to be mistaken for the German verb "kacken," which means "to defecate."
Megan: "Man, Jack Black is amazingly kack!"

Sam: "Dude, I gotta take a massive kack."
Sally: "No, dumbass, that's not how you use the word!"

by blackbayou August 24, 2007
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Female genitalia. Often used in women's college dormatories and in rap songs (hopefully).
Oh god man, you need to smack that kack!
by Erica Camp December 1, 2005
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To bail out or to tell someone that you were going to do something and you don't show.
She said she could do something but the stupid fool kacked-out!
by Corissa August 10, 2004
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it is exactly like the word pack, back and a lot of other words that ryhme with kack but it starts with a k instead of all the other letters
i was writing an essay when i said pack instead of kack
by Poopy Pooperson May 3, 2005
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a person who takes delight in sniggering while masturbating themselves without anyones knowledge and the removal of their trousers
Stevie D enjoys a jack in the kacks during free class in the top study
by aybsteve May 5, 2005
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An injury on the shin typically recieved during mountain bike trials. Caused by the pedals ripping flesh from the rider.
Dude! Check out this gnarly kack I got riding yesterday!
by txfreerider January 5, 2007
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