Coughing excessively, not a regular ahem ahem cough. But a coughing up your lungs cough. Definitely does not mean throwing up.
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To be squided in front of an audience.
That slut yacked me infront of everybody!!!
by Jimmy III July 26, 2006
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Omg I'm so yacked out broo.

Do you have any yack?
by blowwww February 10, 2011
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When vaulting if your upper arm gets yanked back at take off, you are being yacked.
Today at practice i got yacked on my final attept to clear the bar.
by reggie August 26, 2004
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Something or someone who is disgusting or nasty.
Throwing up is YACK! or This coffee taste YACK or She is YACK.
by iam2nocnt November 30, 2009
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