In the world of social media, a plug is inserting something, someone, or some segment for the sake of promotion. However, the “plug” term is used very differently in the world of rap. Be warned because it primarily involves drugs.
Plug, as used by Drake and several others, is someone that has a lot of drugs. It might be marijuana, cocaine, and the like. However, in more recent usage, a “plug” has been used to point to a person that can get you your “fix.” It can be used like this:
“Snoop used to be a plug for Cameron Diaz back in high school.”
“I used to be a plug for A-tier celebrities during the 90s.”