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1.
When in a public or non-intimate setting a female's breast accidentally becomes exposed.
We were getting some pizza after the club and as we were leaving the shop we saw some surprise titties.
by zoombie14 July 23, 2009
 
2.
When a woman's breast look small when she is wearing clothing; however, when she removes her shirt they are surprisingly large.
I thought Sarah had small boobs..but dude, she has surprise titties.
by smoothpuma March 17, 2010