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A unit of measurement used to describe how much peanut butter is used; roughly a spoonful but enough to cover the average sized cock.
Sam enjoys cockfulls of peanut butter.

Sam's Mother asked Sam how many cockfulls of peanut butter she would like with her cherry jelly sandwhichs.

Mr. L told the story of how a cockfull of peanut butter was licked of his entire body.
by Cikster43 December 08, 2011
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