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Noun. 1. A female cat that is extraordinarily evil. 2. Someone who is extraordinarily weak.
1. "Watch your toes...there's a Pussasaurus Rex under the coffee table, scoping out her next kill."
2. "She made you cry? Dude, you are being such a Pussasaurus Rex! Grow a pair, will ya?"
by sonik J January 16, 2007
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