- insulting, taunting, or boastful comments, often as a form of banter, as between competitors; trash talk: At boxing practice there's a lot of gibing and smack talk between the boxers as they go at each other.He won the election but soon found that his campaign-trail smack talk didn't translate well to governing.
- to make insulting, taunting, or boastful comments to or about (someone), often as a form of banter; trash-talk: Reps from the two companies are always smack talking each other on whose cybertechnology is more efficient.She smack-talked him behind his back but treated him like a prince when we were all together.
