Jamie in Jacksonville, Florida, called himself a card, meaning funny or quick-witted, and his 19-year-old roommate wondered whether that meant a credit card or debit card. The expression likely grew out of playing-card metaphors such as sure card...
mag-stripe n.— «In theory, overseas merchants are required to accept US cards (which are called “mag-stripe,” for the magnetic stripe that identifies each card).» —“HomeATM’s “PIN my Card” Solves Chip and PIN Problems” by John B. Frank HomeATM PIN...