1 definition by Azi0056
Traditionally, used to denote the beginning of (American) baseball season practice anxiously awaited by enthusiasts each springtime: If there was grass growing, then the season had progressed enou gh past winter to start the new season: "play ball!" More recently, it has become a slang inferring statutory laws regarding underage females did not, in practice, realistically apply and that instead, the presence of pubic hair (grass) indicated sufficient maturation to begin sexual activity (play ball).
"I know your sister's only twelve, but I go by baseball, not age, "If there's grass on the field, play ball!"
by Azi0056 February 17, 2019