A pirate’s flag with a white skull and crossbones on a black background.At the top of the mast was a red flag, a Jolly Roger if he'd ever seen one....
For gentler fun there's now a Jolly Roger family boat ride in the Pirate Cove, where captains and young pirates (your offspring) can jump aboard together.
The Old Guard is nothing if not sexist, and while it's not exactly unheard of for a Rhodes Scholar to replace a Jolly Roger, one finds it hard to imagine them permitting a former Girl Scout to do the same.
Origin
Early 18th century: apparently from jolly1 + the male given name Roger, possibly in the old dialect sense 'the Devil'.