Cleaning between your teeth with a thin cord or string, or more recently, a dance move that involves swinging your hips side-to-side.
From 'floss,' which originally meant soft silk threads used in embroidery; the dental meaning emerged in the 1800s when the technique was first recommended, and the dance meaning exploded around 2018.
The 'floss dance' from Fortnite became so viral that elementary school kids were doing it everywhere—but dentists had been using the word 'floss' for over a century, showing how one word can suddenly gain a totally new meaning through pop culture.
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