bag of wind—(coll.) a talkative, usually pompous person who has little to say:
- She’s nothing but a big bag of wind.
windbag—
1. a bag of air as of a bagpipe:
- The anatomical structure of the sonorous organs of these Cicadae did not exactly resemble the wind-bag.
2. = bag of wind:
- He is at best a noisy, pompous wind-bag and braggart.
3. a kind of fish which inflate their bodies when stimulated by fear, etc.:
- When it [blowfish] is hooked it inflates itself to many times its normal size. Among its aliases are balloon-fish, puff ball and windbag.