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bouncing or quivering female breasts and/or buttocks
She was a bit nervous about her jelly-on-springs getting unwanted attention.
by The Return of Light Joker May 19, 2010
A bouncing bum, not necessarily female.
The once was a curate at Kings
Whose mind was on heavenly things,
But his heart was on fire
For a boy in the choir
Whose ass was like jelly on springs.
by John Tzetzes April 17, 2011