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1.
person who loves bars and would do anything to have them...it is their favorite way to get fucked up and they would take a bunch often

big moe coined the term in his song "barre baby"
"That girl's a bar baby.. she wanted to fuck me for one."
by nicoleeeeeee April 04, 2006
 
2.
bar ba·by
bar bey-bee

-noun

2. a young child who, when their father is watching them, accompanies him at the local bar. Often to a place with other fathers doing the same with their child.
I didn't turn out too bad for being a bar baby!
by DJ Mastemind September 17, 2010