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The area of the chest right before the boob, slightly before the slope. Not the actual boob or the slope, but very close.
girl 1: Sorry am I laying on your boob?
girl 2: No it's just my pre-boob
by xXmizzcupcakeXx January 26, 2011
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The flesh that is the very first indication of a nice set of tits. Found in the upper chest area above and before any indication of cleavage.
Guy 1: Did you see the tank top Angelina Jolie was wearing the other day? I'm pretty sure I saw cleavage...

Guy 2: Nah, it wasn't low enough to see cleavage, but I definitely saw some great preboob.
by Zbreedbz November 29, 2009
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