fwoomph

The English word “fwoomph” has 2 meanings listed here.

verb

The sound effect of something swelling up or inflating, usually with air or helium, like a balloon.
Being puffed up or inflated, most often with air.

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.