Top Definition
A very tall black man who is able to dunk a basket ball at only 12 years old
Homeboy1: yoooo you saw my niggasaurusrex Jamie out there!?
Homeboy2: awwwwwww yeahhhh son
by Tamer "LiL dEaFy" Attalla December 20, 2006

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A street smart dinosaur minority that jacks other dino's bikes and watermelon.
The Niggasaurus Rex lived around 90 million years ago until it went extinct in a large knife fight against the Crackerdakalaphalous.
by niggasteve11 March 22, 2010

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someone who is deeply immersed in nig culture. this involves eating and drinking koolaid, watermelon and fried chicken everyday all the time and wearing clothes that are a minimun 4 sizes too big.
Panos: " Why is your shirt so big?"
Sandro:" Cause im a niggasaurus rex!"
by Tron Carter Westen November 08, 2008

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big black guy
so i was walking down the street when that niggasaurus rex startled me!
by MOOSEONANOOSE December 21, 2010

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