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alt title(s): Big Bouncy Breasts; Breast Physics; Gainax Bounce
In Gravion, leaning back is... jiggly. (animated)
More Bounce
More Bounce!
Much more Booouuunce!
— Roger Toutman, "More Bounce To the Ounce"

The act of drawing a female character with unusually large and buoyant breasts and without a bra, then animating every individual jiggle, sway, bounce and bobble they undergo. Also known as Gainax Bounce or the Gainax Bounce Effect.

The motion so displayed is typically asynchronous — each breast is animated separately and possesses its own individual movement.

Also used to describe the movement itself. The term was coined by fans some time before 1993 and makes reference to the anime production Studio Gainax, many of whose earlier releases made use of this particular variety of Fanservice. According to a Usenet post from 1993, one particular busty young thing from the Gainax anime Otaku No Video inspired a tongue-in-cheek unit of measurement for Gainaxing: one full bounce is apparently equal to one "Misty May".

For the live action TV version, see Jiggle Show.

In video games, it would involve Jiggle Physics.

When a male does it, it's a Pec Flex.


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