Assmaster 

someone who is the ruler of the assholes. they try to act like their the most awesome person ever, but theyre nothing more than an ass master

"John tried to take my girl from me by doing his dumbass disco rountine"

"what an assmaster"

Assmaster by Sam Baker May 21, 2006

assmaster 

One who has mastered the 'ass'.

'No no, Cartman is the assmaster'

assmaster by the williams July 11, 2003

asstastic 

something that is fantastic (usually referring towards the buttox area).

That girl is lookin' asstastic today!

asstastic by hallelujiah March 22, 2010

assmaster 

one who can convince a girl to give up the ass is an assmaster.

hey girl...how 'bout some ass?

assmaster by Anonymous July 31, 2003

asstastic 

Lame; weak; inferior.

That game was asstastic; damn cheaters.

asstastic by Anonymous L-Value October 11, 2002

Asstastic 

A modified form of "fantastic" that injects the word "ass" to reverse the meaning. Asstastic refers to something that sucks or is of poor quality.

Davo: That pizza was asstastic!
Luis: Yeah, holmes, it tasted like bum!

Asstastic by HugeBreasticle March 18, 2005

Asstastic 

A word used to describe a girl with such a breathtaking, beautiful booty that it becomes that girls defining factor.

That girl is asstastic bro.

Asstastic by Dr fantastic September 11, 2014