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1.
Bouncy-bouncy is the phenomenon experienced when an up-and-down motion, such as one created by walking, running, or in a best-case scenario, jumping on a trampoline, is exhibited by a female. This causes the chest to bounce up and down in a very entertaining manner.
She has some nice bouncy-bouncy happening.
von The Definitionator 29. Juli 2005
 
2.
Used to characterize boobies.
Bouncybouncy!
von LeonC 28. März 2003
 
3.
Bouncy Bouncy is the fancy words for the concept of bounce
The concept of bounce is the law: an object hits the ground at an expotential rate, as it hits the ground, it reverberates and therefore, is pushed into the air by the force if the reverberation
The ball went bouncy bouncy on the gym floor.
von Logan 17. Februar 2005
 
4.
Big beautiful butt.
Jeremy's butt goes bouncybouncy every time he walks down the hall.
von Shawn B. 14. April 2003