Top Definition
moving at an extremely high velocity.

From the Special Theory of Relativity published in 1905 by Albert Einstein and his expression e=mc^2.

Although this term is strictly a hyperbole, since only very small particles in lab accelerators can approach the speed of light, it's use can be an appropriate exaggeration in certain cases.
I just got passed by an R1, he was relativistic!
by paulvmunix February 24, 2006
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