Source : Webster's Revised Unabridged Dictionary (1913)

Brog \Brog\ (br[o^]g), n. [Gael. Cf. {Brob}.]
   A pointed instrument, as a joiner's awl, a brad awl, a
   needle, or a small sharp stick.

Brog \Brog\, v. t.
   To prod with a pointed instrument, as a lance; also, to
   broggle. [Scot. & Prov.] --Sir W. Scott.