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Wiktionary
stoozing

n. (context slang English) A form of arbitrage in which money is borrowed at an interest rate of 0% and invested elsewhere to make a profit until the borrowing period ends.

Wikipedia
Stoozing

Stoozing is the act of borrowing money at an interest rate of 0%, a rate typically offered by credit card companies as an incentive for new customers. The money is then placed in a high interest bank account to make a profit from the interest earned. The borrower (or "stoozer") then pays the money back before the 0% period ends. The borrower does not typically have a real debt to service, but instead uses the money loaned to them to earn interest. Stoozing can also be viewed as a form of arbitrage.