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2 definitions by FST

 
1.
Cup with a lid on it, like for children making the transition from bottle to regular, "grown-up" cup. Also can denote a baby bottle, since kids always want to feel grown-up.
Awwww, you dropped your beaky! Bu bu bu, don't cry-- we'll get you some more appa juice.
by FST November 19, 2004
 
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