Resembling or having a tendency to throw things; characterized by flinging movements.
From 'fling' with the adjective-forming suffix '-y' (from Old English '-ig'). The '-y' suffix is extremely productive in English for creating descriptive words from nouns and verbs.
The '-y' suffix is a shortcut for saying 'having the quality of' or 'tending to do.' A 'flingy' person might be restless and energetic, throwing things about—the word captures personality through a suffix.
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