A person who annoyingly tries too hard to impress with their cleverness; a clever dick.
A person who is overly garrulous or prone to making empty, unsupportable statements; a windbag.
A bag or bladder to hold a reservoir of gas, as in a hot-air balloon.
A lighter-than-air aircraft; a balloon or dirigible.
To speak foolishly, pompously, or at length; to blather.