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Methasaurus Rex 

term given to sketchy meth-heads in or around a city
Its about 10 til, we are driving to Carl's Jr. And we see a Methasaurus Rex, barefooted as fuck! Welcome to Redding, CA.
Methasaurus Rex by ericd000e August 31, 2010

mackasaurus

a total playa. A guy who just spits game nonstop.
-Did you see scully hitting on those sophomores last night?
-Yeah, he was being a total mackasaurus.
mackasaurus by fukgoombchicks November 10, 2009

Mediasaurus Rex 

Someone who knows so much about movies, television and music that they are a monster
I'm borrowing some unheard of movies from Joe, he's a real Mediasaurus Rex
Mediasaurus Rex by FrankoBastid February 16, 2010

mathasaurus rex 

one who likes to shriek and growl when sexually excited by math problems, sometimes waving their arms in a dinosaur-like fashion.
when jimmy began to grunt as he started the math test, there was no doubt he was a mathasaurus rex.

Mockasaurus 

An excessively small penis which was claimed to be, by the owner, a very large penis (or cockasaurus)
Don: Yo I got a cockasaurus.

Bennie: You bullspittin!

Don: Im serious, look!

Bennie: Nah man, thats a mockasaurus. (chuckle chuckle)
Mockasaurus by SychoSurge January 13, 2009

Meatasaurus 

The Way People Call A Carnivore If Unknowing to the Scientific Phrase
Is It a Meatasaurus?
Meatasaurus by NerdyNugget October 13, 2020