shmegegge

/ʃməˈɡɛɡi/
noun
  1. A foolish, inept, or contemptible person; a jerk or a nobody.
    • The boss called him a shmegegge after he messed up the report again.
    • Some shmegegge cut in front of me in line at the store.
    • Don't listen to that shmegegge; he doesn't know what he's talking about.