An exclamation expressing frustration, anger, fear, or strong emotion in a dramatic or playful way.
An onomatopoeia with no clear origin—it mimics the sound of anguished shouting and has evolved as comic book and internet culture developed, gaining popularity in written form.
'Aargh' is almost purely a written invention—you rarely hear people actually say it aloud the same way they write it. It's one of those words that became real through comics and writing, showing how language keeps evolving through new media.
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