Top Definition
A girl that is not overweight at present, but shows great potential to get fat. This is usually best observed in skinny women with huge "cankles." The theory being that God gave her big calves and ankles to support future weight gains.
"Man he better not marry her, she has huge whale potential. She drops out one kid and she'll look like Roseanne Barr."
by Keifermail July 26, 2008

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