knuckle cracking

Knuckle cracking is a common behavior enjoyed by many. It can become a habit or a way to deal with nervous energy; some describe it as a way to "release tension." For some, it’s simply an annoying thing that other people do.

cal. 195 (social impact)

Its essential feature is that it is annoying to others and presumably not harmful.

Knuckle cracking: Annoying and harmful, or just annoying? - Harvard Health

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