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3.
Having a great amount of excitement. So much, that you act crazy, jump around, get in others faces, and may foam at the mouth, relating this crazy to having rabies. Can be contagious.
"Woo! I caught the yaybies while planning my birthday night!"
by Jerbear1991 December 23, 2012
 
1.
The better name for boobies as the word boobies has the word "boo" in it.
interchangeable with hooraybies and okaybies.
Coined by the comedian Myq Kaplan.
maybe not hooraybies because it sounds like some sort of infectious disease.

Guy1) Look at those yaybies!
Guy2) I know! Aren't those great? They look like globes!
by rickrock95 February 10, 2010
 
2.
the good side of boobies except it's not boo-bies it's yay-bies
she has nice yaybies
by jb1878 April 19, 2010