Mischievous, reckless, or wild behavior; playful trouble-making or rowdy conduct.
From Hell plus -ery (a collection or practice of). It suggests behavior so chaotic it's 'hell-like,' but often with a playful rather than evil connotation.
Hellery captures something that modern slang lost—that sense of chaos that's fun rather than dangerous. It's the word your grandmother might have used when boys were being rowdy but not actually evil, just... raising a little hell.
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