Something that fizzes, such as a tablet that creates bubbles in water, or something that fails or disappoints (British slang).
From 'fizz' plus the agent noun suffix '-er,' indicating something that performs the action of fizzing. The meaning shifted in British usage to mean a failure or flop.
British slang brilliantly repurposed 'fizzer' to mean 'failure'—because a fizzy drink going flat is disappointing, so any disappointing event became a 'fizzer,' showing how metaphor transforms meaning!
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