a very naughty extremly fat thing. sometimes wears jersey with last name on back but numbers and letters lok too small due to extremely large size. professional eater; glutton. founder of advanced placement lunch
ex 1) The whale was a REXXX and made love to another exremely unattractive whale.
ex 2) The REXXX and the chormander are two animals that are very hard to miss not just because of their enormous sizes but also because of their repulsive odors.
by Limz January 8, 2005
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When a guy's Herculean penis is so huge you fear for the safety of your vagina
I screeched like a ptylerdactyl when I saw his Fuckosaurus Rexxx.

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by fuckgurlnumbr9 March 3, 2015
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