bag–a–mout

or

bagga–mout

Definition
  1. A talkative person who makes a lot of big plans or promises but doesn't deliver.
    Usage

    Dem politician yah a jus' bag–a–mout who mek empty promise an' caan delivah.

  2. A loud mouth who pretends to be bold or brave but is a coward when challenged.
    Usage

    Mi did know seh John a bag–a–mout enuh. Di man dem rush him an' him run weh.