Mechasaurus 

A large, domineering, overly complicated, frightening, mechanical Monster truck, dinosuar beast, machine dragon.

"Holy Mechasaurus! Return the innocence!"

"The flames of Mechasaurus won't have us tonight if I can help it" - Captain Paint

Mechasaurus by Swiftyoldboy January 23, 2023

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.

mathasaurus rex by winerschnitzal111 June 9, 2010

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