American Heritage Dictionary
(2)
Century Dictionary
GNU Webster's 1913
(1)
WordNet
(2)
Elsewhere on the web
This is why Rush is called a gasbag in the first place.— Original Signal - Transmitting Digg
And Scalia is such a gasbag that I'm sure he had no problem engaging, and perhaps occupying, Obama in conversation.— BAGnewsNotes
Here's a recap of every Sunday gasbag discussion about the VP debate last Thursday and the next presidential debate on Tuesday:— Hullabaloo

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