https://www.investopedia.com/terms/d/deadbeat.asp
What Is a Deadbeat?
Deadbeat is a slang term for a credit card user who pays off their balance in full and on time every month, thus avoiding the need to pay off the interest that would have accrued on their accounts.
A deadbeat is also called a "nonrevolver" or a "transactor." They'll get this derogatory name by being a potentially less profitable customer for a credit card company than a revolver, or someone who carries a balance from month to month.
