boy
n.— «Under questioning by District Attorney David O’Leary and Peterson, Bier said Gardner believed the powder was cocaine, possibly just from looking at it, but that at the jail he understood it to be heroin based on hearing others refer to it as “boy” which is street terminology for heroin.» —“Inmates face drug, homicide charges” by Jen Scherer Beloit Daily News (Wisc.) May 24, 2005. (source: Double-Tongued Dictionary)
Further reading
After misunderstanding the term tummy ache as tummy egg, a three-year-old has questions. This is part of a complete episode.
Related
What if, instead of being an inanimate object, a dictionary were alive? That’s the idea behind a lavishly illustrated new children’s book called The Dictionary Story (Bookshop|Amazon) by Oliver Jeffers and Sam Winston. This is part of a...