Top Definition
the top part of a girls boob.
show me some of your top boob
by rodney42 September 27, 2006
1 more definition
topboob is that bit of boob that you can basically see every time a girl is wearing something that shows off a bit of cleavage, a poor man's sideboob or/and underboob.
Oh. Oh well, topboob is topboob.
by beeeeeeeees June 21, 2011

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