Meaning

• A stupid person.

• Any of various large tropical seabirds from the genera Sula and Papasula in the gannet family Sulidae, traditionally considered to be stupid.

• In the game of croquet, a ball that has not passed through the first wicket.

Meaning

• To behave stupidly; to act like a booby.

• To install a booby trap on or at (something); to attack (someone) with a booby trap.