1) A type of bird that is often seen around water and wetlands, it has the appearance similar to that of a stork.
2) Slang: On the street level drug trade, the term is slang for heroin. More common as an African American English slang term, it is used as just one of the many synonyms for heroin.
Often enough the use of slang when buying drugs is preferred because it lets the dealer know that you are not (or much less likely) an undercover police officer. In other words "You cool", or "you down"
" Yo, dis nigga need a bun (= bundle, denotes 10 glassine bags of heroin) of dat HERON"!