Top Definition
When a sweaty fat fuck has folds of fat on their back that resemble saggy granny titties.
"that fat slut was walking around with her shirt wedged in her rackback.
by pete burns September 15, 2007

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Back pain suffered by women with large breasts
Her massive fun bags were causing her horrendous rack back
by tennis ball head May 07, 2010

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

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