Playing ball sports, or in slang, partying and having fun with friends; also the action of forming something into a ball shape.
From 'ball' (spherical object), which comes from Old Norse 'bollr.' The '-ing' suffix creates the present participle form used as both verb and noun.
In hip-hop slang, 'balling' means living lavishly or succeeding financially, but the same word describes forming something spherical—English constantly reuses shapes as metaphors for success and completeness!
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