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It is basically an insult that can easily enrage people of the gender known as female, because it implies that their clit is the size of a penis! Hence the "Rex" since the T-rex was quite a large dinosaur. It comes down to calling a girl a shemale.
OMG P**** raped me up the ass with her huge clit! She's such a Clittosaurus Rex!
by Charlie Schween June 21, 2016
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