Jafftastic 

Something so fantastic it makes you want to spaff in your pants.

Andy: Oh my god Ben? Did you make this asparagus soup?

Andy: Why yes Ben, I did.

Ben: Fuck me. It's bloody jafftastic!

Jafftastic by Encyclopaedo July 19, 2010

Jacktastic 

A person named Jack who is fantastic.

"Man that guy Jack is fantastic"
"He's fucking Jacktastic"

Jacktastic by Jack Likes Fire August 2, 2007

Janktastic

Fabulously janky. The jankyist of them all. The opposite of fantastic.

My ride is janktastic now that it's missing both headlights.

Pete's new shoes are janktastic.

That ducttape holding your shelf up makes your cubicle look janktastic. hollaaaaaa

Janktastic by KarlaS May 6, 2006

Jazztastic 

Jazztastic means cool , awesome , legit , cute , handsome , sexy , and pretty much almost anything you want it to mean that is positive .

She thought that her new hat looked jazztastic with her new outfit .
He thought his banana split tasted jazztastic .

Jazztastic by Jazztastic queen of da Kitties October 25, 2015

jawntastic 

An adjective to describe EVERYTHING, good or bad.

Mr. Morris's class is jawntastic

jawntastic by nuhtowel November 26, 2007

Japtastic 

To be or do something/someone of asian greatness.

when some thing goes the way you whant it or is fricken sweet.

something ninja.

1. "Dude that party was Japtastic"

2. "His ride was Japtastic!"

Japtastic by Willie "SexyNinja" Coffman March 16, 2008

Jamtastic 

Set of rhythms with an intense climax that builds you up unitl your about to explode then relieves you into a blissful state of euphoria.

That Hookah show we saw last night was jamtastic!

Jamtastic by Ryan Haskell February 27, 2008