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1.
The fleshy, poochy, or jiggly layer of fat where a fit person's abdominal muscles would be.
Maybe if you worked out ever, or ate something other than gummy bears and rice pudding, you wouldn't have such saggy flabdominals.
by erbaby February 26, 2008
 
2.
What an unfit person claiming to have a six pack has.
Unfit guy: "Sup, I'm ripped and got a six pack"

Normal guy: "Yeah right, you've just got flabdominals"
by Pashizzle500 December 03, 2011