Giantastic 

adjective.
A mix of combination between fantastic and giant, it can be used in either positive or negative.

BEHOLD! I have just encountered one of the most giantastic pencil!

Giantastic by anonymous January 17, 2022

grandtastic 

adj. a combination of "grand" and "fantastic" used to describe extraordinarily wonderful or exciting happenings

1. I just know the dance this Friday is going to be grandtastic!

2. I got an A on the test-this is grandtastic!

3. Isn't it grandtastic that our team just won the championship?!

grandtastic by Autumn K. December 10, 2007

Ginastic 

Something that is fantastically gigantic!

'His feet are size 14, they are GINASTIC'

Ginastic by Ryebeach January 13, 2010

glamtastic 

When something is so uber glam that it deserves more recognition than just something which has a standard level of glamness

Oh my gosh... your hair is glamtastic!

glamtastic by ambyglam March 16, 2008

Gaytastic 

Contrary to what the stereotype would be, it means "awesome/incredibly cool." The opposite of the Hilary Duff ad campaign. Instead of getting rid of saying "that's gay," let's just make it a good thing. Yay equality!

Whoa! That's Gaytastic man!

Gaytastic by NerdAlert965 January 15, 2011

Viantastic

That one cute girl in your class who won't stop bragging about having 144K subscribers on youtube.

Gab: Hey have you see Viantastic lately
Fyrus: Oh ya, I just saw her go to record another fashion blog

Viantastic by Ethanol October 27, 2019

gastastic 

one who is full of gas and continuously makes large noises from either orifice.

Wow Will! You have some loud burps! You are gastastic!!!

gastastic by light urple May 4, 2007