Meaning of tinhorn

tin•horn

Pronunciation: (tin'hôrn"), [key]
— Slang. Slang.
—n.
  1. someone, esp. a gambler, who pretends to be important but actually has little money, influence, or skill.
—adj.
  1. cheap and insignificant; small-time: a tinhorn racket.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.