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2.
being very flabby or something of the sort.
having flabby fat on your body, jiggling in some way.
"WOW! Did you see Graham jiggle his leg in english today?!"

"I know, it was Flabtastic!"
by T-T-T-Tia May 25, 2007
 
1.
Someone who is fantastically fat. Usually accompanied by bitch tits.
"Christ, look at him! He's flabtastic"
by apparentlyso July 29, 2004
 
3.
An adjective refering to someone who has a lot of excess fat.
*woman walks past*
"woah shes flabtastic"
by lilemmaleebabee May 08, 2007