Definitions for gasbagˈgæsˌbæg
Random House Webster's College Dictionary
a bag for holding gas, as in a balloon or dirigible.
Slang. a talkative boastful person; windbag.
Category: Status (usage)
Origin of gasbag:
a boring person who talks a great deal about uninteresting topics
the bag containing the gas in a balloon
A bag or bladder to hold a reservoir of gas, as in a hot-air balloon.
Metaphorically, a person who is overly garrulous or prone to making empty, unsupportable statements.