Top Definition
While getting head from someone, they have ice in their mouth and putting fingers up your ass. The number of fingers determines the gallons of the frosty. For example, 1 gallon frosty being one finger, a fist being the five gallon frosty.
I know a chick with petite hands that works at Wendy's that I'd like to give me a 5 gallon frosty.
by Vajageddon March 06, 2010
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