1. Also called Sadie, Sadies . a party, dance, or other social event, esp. one held annually among high school or college students, to which each girl escorts the boy of her choice, or invites him to escort her.
2. a day (Sadie Hawkins Day) or night, often in November, when such an event or events are held.
[ 1939, Amer.; after the race held on Sadie Hawkins Day (in the cartoon strip Li'l Abner by Al Capp), in which single women pursued bachelors ]