The definition of PB varies greatly from person to person, however it is most commonly used when describing a female with gorgeous, small boobs, or "Pure boob" as it is commonly refered to.
A example of pure boob could be when one is smashed into a elevator like sardines in a can, and the woman with the pure boob's chest is smashed to your back.
Damn dude, did you see that girl?
Yeah, she had PB
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