A plug (or the plug) is a person who has the ability to get or supply hard-to-find items, especially drugs.

What does the plug mean on Snapchat?

Drug dealers are called “plugs” on social media, sometimes using a plug emoji to describe them. Some plugs “quick add” people on Snapchat, which categorizes users by zip code.

What does the slang plug out mean?

(Ireland, transitive, colloquial) To unplug; to remove (an electrical device) from its socket.