The word "newjack" is another term for "newbie" or "noob". It means one who is new to something and lacks experiance and style in it.
Look at that guy try and hardcore dance, he's such a newjack.
by Virtue January 8, 2005
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"They think that I'm a new jack/ but only if they knew that/
They who think wrong are they who can't do that"
-Rakim, Lyrics of Fury
by Jason G.L. Chu April 12, 2004
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1.) Jerome "Newjack" Young. The most hardcore professional wrestler of ALL time. Former bounty hunter, with four justifiable homicides to his credit. Known for his profficient use of weaponry. Including such objects as trash cans, vacumns, crutches, and staple guns.

2.) Any quick, random mugging. In which the assailant exits, as abruptly as he enters.

"I watched this guy get smoked for his Ipod. It was the worst newjack I ever saw!"
by D. Gould July 27, 2006
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Is a basketball slang term given to first year players in college or pro basketball that come from the Hip-Hop urban culture. The players come on the scene with style and charisma to go along with an explosive game.
LeBron, Carmelo, and D.Wade were Dunkadelic Newjacks that came into the NBA last season and delivered. The Atlanta Hawks have a rising star in Dunkadelic Newjack Josh Smith, the 2005 NBA Slam Dunk champion.
by Derrick E. Vaughan March 29, 2005
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