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When a girl pulls up her shirt exposing her breasts pushed together but not showing the nipples.
She sent me a sext with sunderboob
by LibraryGirl February 24, 2015
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The revealing of both the side and the bottom area of a womans breast.
"OMG! I can't believe I'm seeing both side AND under boob!!!!

"No, thats Sunder Boob!"
by Pigliver July 19, 2009
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