A whirlwind is defined as an almost-vertical column of wind that moves rapidly around in a funnel shape, or someone or something that has a ton of energy or a lot going on.(noun)
The definition of a whirlwind is something that is done very quickly and without a lot of thought.(adjective)
An example of a whirlwind is a whirlwind courtship, an engagement and marriage that happens within two weeks of the bride and groom meeting.
See whirlwind in Webster's New World College Dictionary
Origin: ME whirlwynd, prob. based on ON hvirfilvindr
See whirlwind in American Heritage Dictionary 4
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