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A scale from 1 to 10 that tells how likely a hot girl is to turn into a fatty later. The higher the number, the more she’s gonna fail.
I gave her a 9 because she eats like a pig.
That girl’s P. T. B. U. is 7. She’s gonna blow up like a balloon.
Her P. T. B. U. is 10. She’s gonna be a full-blown disaster.