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1.
Bah-Bah is a little nickname for a cute bf/gf or even your pet cat,Its only acceptable when your gf is short and when your bf isn't macho.
1)e.g "come here Bah-Bah , that's a good boy "

2)e.g

person1:"Don't you think your bf's clingy?"
person2:"Nah Bah-Bah's adorable <3 "
by Deathkittyx October 07, 2012
 
2.
Mother's babyspeak for a baby bottle.
Awwwww, does baby want his bah-bah? There, there... bu bu bu bu... don't cry.
by FST November 19, 2004
 
3.
A strange term of endearment used between goofy Blacktino men & small Hot-Topic shoppin' Philippino women. It is meant to mimick the noise a sheep makes (as in "Bah-Bah black sheep, have you any wool"). Needless to say, this is probably not a term many people will ever have use for... But hey, knowledge is power, right?
- "Hey bah-bah, bring me a pop-tart?"
- "Yes, bah-bah... if the Sheep can have a bite..."
by BadtzGirl October 07, 2005