Top Definition
A Person Who Smokes And Deals Crack In Their Free Time.
Usually A Big Fat Black Guy.
Person A: Oi Bench, Another SmackJack Is Coming Over.
Person B: Quick, Stab That Mofo And Nick His Wallet!
SmackJack: **Gets Stabbed**
Person A: Shame
by Henryy Morgann March 18, 2008
The act of smacking your girlfriend, and/or violently laying the smackdown on her stupid mouth.
Girlfriend: "Hey, your an idiot with a stupid mouth!"

James/boyfriend "Say that again and I'll lay the smackjack on yo ass!!!"
by Russ Diesel October 27, 2011
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