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1.
1) A cartoonish sound effect originating with the animaniacs. A sound of bouncing or jumping, especially:

2) The sound of large breasts bouncing.
I was watching a gif of a big-boobed blonde jumping rope. Boingy, boingy, boingy!!!
by Nunuv Yabizness January 07, 2012
 
2.
a piece of gristle or fat in meat, usually found in ground meat, that when you bite into it, it bounces back into shape
I was eating a hamburger and found a large boingy.
by moso February 04, 2011
 
3.
To perform the act of sex with someone.
John is going to boingy Jen.
by Lizardrod July 15, 2004