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A combination of Zack and King into one word.

Created by the infamous J-Money
Go Zacking
by J-Moneyyyyyy February 17, 2011
used as an adjective
Zacking is a word that shouldn't be used or a zack will punch you...hard.
"Dude, u suck at Halo!"
"Quit Zacking around and start getting some kills."
by kay-oss November 22, 2007