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An ass so large and luscious, that it has it's own gravitational pull. Typically located on an African-American Female. If you come too close to one please beware, you might fall into the event horizon--much like a black hole--and not be able to prevent yourself from grabbing it. This term is a combination of the latin word 'gravitas' (weight), and the word 'ass.'
Tyrone: "DAYUM BRUH! Have you seen dat phat ass on Shaniqua lately?"

Jamal: Yeah! Seriously...she got dat gravitass!
by Mister Smoooth May 24, 2011
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when the force of having to shit is so strong that gravity has become a factor
I tried to wait until lunch break but the gravit-ass of the situation was so strong that 1 made the 100 meter dash to the bathroom early
by Jordo16 July 09, 2018
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