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

Flappasaurus 

Flappasaurus – A common condition of people from Central European decent(most notably from the Germanic / Franco regions) where the sufferer of the condition bursts into uncontrollable fits of panic or excitement characterized by a frantic arm swinging or "Flapping".

This condition is not curable and sadly for those who suffer from it they are quite often the butt of all jokes in the office / social environment which in turn leads to social alienation or certain stigmas.

Flappasaurus' are funny

Flappasaurus by TPD OH YEAH December 6, 2009

Fapasaurous 

The Fapasaurous, also known as a "Fapasartous rex" is a large mammal found in caves all around north america. They generally feed off "Forum trolling" and "Internet porn" They make a shriek similar to a high pitched girl, and are usually found hiding out at star trek conventions.

Do not confuse said cave monster with the "Fupasaurous" as they sound similar, this is an entirely different animal.

- More common facts on the Fapasaurous is their large forearm, and grunting noise.
- They typically never mate, and it has reduces their population reduced dramatically.

- The location of a female Fapasaurous is almost non existent.
- Unlike most humans, the Fapasaurous reproductive organs have been in such heavy personal use, that they can last over 8 times longer the the typical male.
- Their reproductive organs are also generally 2-3 times larger then the normal humans.

The fapasaurous was found hunched in the corner

Fapasaurous by Icecreaman - spirestone October 15, 2010

flapasaurus 

One that talks too much. A person that can't shut up. A yapper.

Sharon, why don't you ever shut up? You're such a flapasaurus.

flapasaurus by stek69 July 30, 2009

fapasaurus 

a person who faps all the time

This guy is a fapasaurus no matter where he goes

fapasaurus by 658hit May 16, 2014

flopasaurus rex 

That one friend who consistently flops on the plans

Theo is a flopasaurus rex

flopasaurus rex by RaekwonMan May 7, 2018

Flakesaurous 

on a night out after ignoring your texts all day. Usually flaking as a result of their significant other putting their foot down and don’t giving them permission to leave the nest in search of fun. This is a common occurrence, and when a permission slip is actually permitted on rare occasion the flakesaurous Rex will leave the night early as they aren’t used to fun and can not handle it in abundance.

Their spirit animal is a Flakesaurous Rex

Flakesaurous by Big Money Wes June 17, 2018