v. Using one's own money from previous drug sales to rebuy more drugs to sell.
Past tense: re'd-up
Present tense: reing-up
"Every n*gga round me sell white; Re-up and move the sh*t in one night" -Young Jeezy; Ya Dig
"What you rein'-up with, I spent it all in Strokers" -Young Jeezy; Air Forces