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alt title(s): Big Bouncy Breasts
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.

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 video game version, which isn't limited to Japanese games, see Jiggle Physics. For the live action TV version, see Jiggle Show.

The typical fan reaction varies by gender: Men tend to be slack-jawed in amazement. Women tend to wince in pain.

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


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