The act of filling something with gas, or talking excessively about unimportant things.
From 'gas' (17th century, from Dutch 'gas' meaning a vapor-like state) plus the suffix '-ing' indicating an action or process. The sense of talking excessively developed in the early 20th century as slang.
The word 'gas' was actually invented by Flemish chemist Jan Baptist van Helmont in the 1600s—he needed a new word for vapors that didn't behave like regular air, so he created it from 'chaos'! The slang meaning of talking a lot comes from the idea that hot air is just gas.
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