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1.
Originally a term used amongst agricultural communities in northern Georgia, the word 'yaboo' was used to describe crops that were in unnaturally high demand at given times. Also known as "Fad Crops".

More recently, the term has been applied to fads in pop culture; often used when categorizing.
I'm so sick of vampires. I can't wait to see what the next big teen TV yaboo is.

I just found all my old Tamagotchis. I can't believe I actually spent money on these yaboos.
by House of Gloom December 21, 2010
 
2.
Breasts... Yeah thats right
Man shes got some juicy yaboos.
by Steelpitcher July 15, 2005
 
3.
A reaction to something good & bad.

Origin:
A combination of yay and boo.
I got the job, but it pays less than I thought... yaboo.
by mick129 August 08, 2010
 
4.
Not being overly fond of yahoo
You on yahoo? yaBoo.
by Hercolena Oliver December 19, 2008