Top Definition
When the bottom half of a girl's tits is exposed. Usually used as an otaku term.

Western equivalents include reverse cleavage (upside down), neathage (the nether half), or Australian cleavage (down under).
Otaku: Wow, check Kan'u's shitapai. Just a little pull and her boobs will flop!
by Da_Nuke July 05, 2009

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