Green’s Dictionary of Slang

1. (US drugs) heroin.

1993		J.H. Davis Mafia Dynasty 185: Two friends of theirs had informed him one of his soldiers, Pete Tambone, was trading in babania.
1994		J.M. Miller Big Lie 30: ‘Cleaned him up, got him off the babania. We thought he was straightened out, but then he turns around and goes nuts on us.’ ‘Babania! Tony was on heroin?’.
2001		N. Tosches Where Dead Voices Gather (ms.) 356: Bang that babania, drink that booze, shovel down those pills; but stay away from that spook called Emmett.
2007		P.J. Devico Mafia Made Easy 78: Ruggiero knew he was in deep trouble and would likely get clipped for dealing in babania, the mob term for heroin.

2. generic for the drug trade.

2003

J. Mannion Everything Mafia Bk 210: Babania is a word for the drug traffic, especially heroin.