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a: focused, alert, relaxed and calm, wide awake, but not hyper, smiling

b: exceedingly great

c: conceive or seemingly conceived by taking XanoLean
I feel Xantastic!
Xantastic by AmyP March 15, 2012
to be under the influence of xanax and feel absolutely care-free and fantastic.
After a very stressful day at work, Susan took a Xanax to relax. After about 5 minutes the stresses of life seemed to fade away into oblivion leaving her feeling fucking xantastic.
Xantastic by nunyabiznus October 10, 2012

Fantastic Four

The most fantastic part of women: 2 boobs + left & right ass cheek.
Fantastic Four by anteater97 August 14, 2014

vantastic sex 

Juan said he had some vantastic sex in the Chevrolet!
vantastic sex by I, Wreckerrr November 16, 2016

Big V The Fantastic Spartan 

Big Vic The Spartan was a fantastic Spartan who fought alongside Jesus Montiel Christ aka Jesus Christ against the Athenian Army who was led by Big Vic's brother, Big Vic the Athen. Big Vic the Athen had allies such as Nicholas Gurr and Pedro The Persian who is later revealed to be Pedro Basim. Big Vic is friends with Captain A. Beard and is the long lost brother of Vin Diesel aka Dominic Toretto.
You're such a Big V The Fantastic Spartan, you can wipe out an entire army

Fantastic Four

Four males beat their boners, on to one individuals head. Can either be sexually pleasurable or an act of punishment.
John: So Ashley do you want me and the boys give you a Fantastic Four.

Ashley: OMG, like totally
Fantastic Four by Big Red 78 March 14, 2011