(idiomatic) To have no common sense; to be ignorant of the most basic facts; to be very confused.

(medicine, informal) Initialism of brought in by. / (business) Abbreviation of business is business.

To notify improperly, giving inaccurate information, or giving the correct information to the wrong people or in the wrong manner.

(fandom slang, Internet slang, furry fandom) A hyena.