Definition

An unexpectedly fabulous, improvised performance moment that deviates from the original plan but somehow makes everything better, earning universal approval from both performers and audience. It's brilliance masquerading as a happy accident.

Example Usage

The band started riffing during the bridge and it was totally foilissimo—nobody wanted them to stop.

Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=foilissimo&defid=15894033)

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