Used other than figuratively or idiomatically: see big, boy. / (idiomatic) A large object or person. / (idiomatic, informal) An adult male, considered to be sufficiently mature and independent.

plural of big boy

(idiomatic, plural only) The people or bodies with the most influence and/or power.

Alternative form of big-boy pants

(informal) Pull-up underwear worn by a boy during and after toilet training, as contrasted to the diapers worn during infancy.