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A medical condition in which women with large, natural breasts exhibit wild and uncontrolled mammary motion while walking. Usually occurring when breasts are unbound by brazier.

See also: jubblin jibblers or jubblin jibbleronis
"The blonde in the tank top headed our way has a severe case of jubblin jibbleritis, we probably ought to see if she needs assistance."
by Andy Wolff June 30, 2013