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Flakasaurus rex 

n. (flake-a-sore-us-rex) a. Someone who is unreliable and never does what they say they are going to do.
b. The biggest flake you know.
Tim: Hey, John, I thought you said you were coming.

John: No, dude, I have to wash my dog.

Tim: You're such a flakasaurus rex.
Flakasaurus rex by -Angel- July 16, 2011

Flefasaurus Rex 

A Flefasaurus Rex Is A Preistoric Animal That Lived Over 70 Million Years Ago! Unfortunatley They Were Hunted To Extinction By It's Main Predator, The Worm!

Unfortunatley, Due To The Flefasaurus Rex's Small Size, Inability To Run, Lack Of Muscular Strength, Inability To Fly, Unable To Defend Itself And Just Being Downright Retarded! The Flefasaurus Rex Was Hunted And Killed By An Animal That Was At The Bottom Of The Food Chain.
1) "Jerry, quick! Over here, I found something!"

"What is it Dave? This better be good!"

"I think I found a fossil"

"Whoah! that's a Flefasaurus Rex! The rarest creature of all!"

2) You're such a Flefasaurus Rex! (Meaning, stupid or retarded)
Flefasaurus Rex by SuperMike455 August 1, 2012

flopsaurusrex 

That friend who constantly bails on plans like he don't care.
Theo is such a flopsaurusrex
flopsaurusrex by RaekwonMan February 22, 2018