Large, natural, usually unbound breasts which bounce and jiggle wildly as a woman walks.
"Check out the jubblin jibblers on the blonde in the tank top walking across the street. Those two guys over there should see if she has jubblin jubbleritis."
by Andy Wolff June 30, 2013
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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
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