Green’s Dictionary of Slang

plug n.7

[play on connection n. (2)]

(UK drugs) a drug (occas. firearm) seller, usu. a major wholesale supplier/importer.

Urban Dict. 14 July 🌐 plug a source from which to score drugs, principally marijuana .
Section Boyz ‘Trapping Ain’t Dead’ 🎵 Used to run from the plug and it can sign me.
410 ‘Four Door Coming’ 🎵 Mana got links for the am bits, might have to rob me a plug.
Kash Doll ‘Panda’ 🎵 I got a plug in Atlanta / [...] / He buy me gifts, I call him Santa.
[US]Woods & Soderburg I Got a Monster 10: He followed a procedure: Tell Stevenson he could go free if he’d flip and give them another name—his plug or a rival dealer.
[US]Woods & Soderburg I Got a Monster 42: t was the kind of pill-to-pusher-to-plug work Jenkins had made a name for himself doing—only with guns.
Central Cee ‘Loaded’ 🎵 Coulda ran off the plug / But I kept it real and I showed him love.