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1.
The act of having sex with a crease, fold or other indentation in the flabby flesh of an obese person.

"flubbing - to find a fold and fuck it"

Probably from 'flubber' - flab + blubber
"Oh God! He's off flubbing with that buttertroll from before isn't he?"

"He suffocated while attempting to flub her back-tits"
von UrbanVoodoo 24. September 2009
 
2.
The act that Cubs fan perform on themselves or other Cubs fans around them. Also can be a synonym for masturbation.
After Carolos Zambrano's no hitter in Milwaukee all the Cubs in attendance fans began flubbing themselves.
von dd522 9. Juni 2009
 
3.
Doing something so incredibly epic, it's the next stage.
Invented by Flubby.
Bob: Hey did you see me do that triple backflip earler?

Billy: yeah you were really flubbing
von Flubetto 15. Juni 2013
 
4.
Fat or Obese people crumping hardcore.
Oh look at Sally over there flubbing. So sexy.
von PongPing 20. März 2011