n. bag of douche, i.e. douche bag; most likely of Italian-American origin. Can be used as an insult but is usually a term of familiarity and endearment.
Vito: Hey you old bagadoosh! How the hell are you?
Vinnie: Yo, who you calling old, you fargin' bagadoosh ya?
Baby Guido: gurgle...bagadoosh...sppfft..
Vito: Hey, that little bagadoosh Guido said his first word!!
Vinnie: He's a little bagadoosh off the old block.
Vito: That makes no sense, you dumb bagadoosh.