Green’s Dictionary of Slang

busy bee n.2

[rhy. sl. = PCP]

(drugs) phencyclidine.

[UK]Daily News 23 Feb. 5: Angel dust goes by dozens of street names [...] Peace pills, white powder, superjoint, busy bee, hog elephant tranquilizer, crystal, and green tea are some of the more popular names.
[US]ONDCP Street Terms 5: Busy bee — PCP.