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1.
An arabic battle cry while slitting someone's neck with your hand. People in high-school yell this out of nowhere during a greeting, conversation, or game of assassin.
Mike- Yesterday was so amazing, she finally let me get..
Steve- HAJEEB!!
Mike- Ahhh you little asshole dickface.
by Mickeyiotov May 28, 2008
 
2.
good, nice in gulf arabic slang
in arabic, walla hadda hajeeb
(damn, thats good)

or when your talkin in english

shit man, hajeeb...when talking about some plans or good news
by faraaz May 05, 2005