1. An amazing symphonic/power metal band from Finnland, combining female vocals and amazing lyrics to form the ultimate awsomeness in music
2. a verb. to decorate something with Nightwish or the like. usually done by crazy fanboys or fangirls that are either very bored, truly fanatical, or have had too much red bull
1. Let's go to the Nightwish concert!
2. Come over and see how I Nighwished my bedroom wall!
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