noun

1. A stupid person.

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

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

Synonyms: sulid

verb

1. To behave stupidly; to act like a booby.

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