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Refers to woman's breast that have not had any surgical operation performed on them that would make them bigger, or on rare occasions, smaller. The original pair of breast. Better than the fake ones.

In a way similar to stock rims on a car. Which are the rims that come with a brand new car when it's manufactured.
Jenna Jameson definitely doesn't have stock boobs. I don't think she ever did.
by MrTallyMon August 08, 2012
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