Meaning of smart ass

smart' ass"

Pronunciation: [key]
— Slang (sometimes vulgar) Slang (sometimes vulgar).
  1. a wise guy; know-it-all.

smart-ass

Pronunciation: (smärt'as"), [key]
— Slang (sometimes vulgar) Slang (sometimes vulgar).
—adj.
  1. characteristic of a smart ass or wise guy.
—n.
  1. See
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.