British slang meaning pleased, satisfied, or delighted about something.
From British railway slang 'chuff,' imitating the puffing sound of steam engines; originally meant the sound, then came to mean feeling pleased or 'chuffed up' with satisfaction.
This delightful British word captures the onomatopoeia of Victorian steam trains—'chuff-chuff'—and somehow that mechanical sound transformed into an expression of pure joy, which is genuinely whimsical.
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