all hat and no cowboy

Meanings:

• 1.

  United StatesNorth Americainformalcolloquialhumorous
  • A person who boasts or affects the appearance or attitudes of a particular role (especially a tough or competent one) but lacks the qualities, skill, or substance to fulfill that role.
  • Someone who is all show and no real ability; all talk and no action.

• 2.

  United StatesNorth Americainformalcolloquial
  • A pretender or poseur: someone who adopts the trappings of a profession or identity without the competence or authenticity to back it up.