Of words or actions: Full of boasting.

Of a person: that boasts about himself or herself. Of words, actions, personal qualities, etc.: that boast about or serve to glorify the person who…

Of a boastful nature or character; indicative of, proceeding from, boasting or vainglory.

Of a person: that engages in boastful or insulting banter; that talks smack (cf. to talk smack at talk, v. additions).