Top Definition
When the abdominal area gets fat and soft and starts rolling and weeping down over the waistline of pants
That lady should not be wearing a two piece bikini with that tumbling sixpack shes got.

I used to have abs of steel....now I got me a mad tumbling sixpack.Damn,marriage sucks!
by Lunicus December 17, 2006
5 Words related to tumbling sixpack

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