The BRRRR strategy was coined by Brandon Turner and stands for Buy, Rehab, Rent, Refinance, Repeat. This strategy is where an investor buys a fixer-upper property using short-term funds (oftentimes cash, hard money, private money, or other creative means), fixes up the property, rents out the newly renovated property, and seeks a new long-term loan (a refinance) to pay off the old short-term loan. This refinance will free up the short-term capital that was used, allowing the investor to repeat the process again and again. For more information, check out the book "Buy, Rehab, Rent, Refinance, Repeat" by David Greene.