Someone who throws something; in British slang, a derogatory term for someone considered foolish or annoying.
From the verb 'toss' (of Scandinavian origin, possibly from Old Norse 'tossa') plus the agent suffix '-er,' creating a word that evolved into an insulting term in modern British English.
The word 'tosser' is a perfect example of how innocent descriptive words become insults—it started as just meaning 'someone who tosses,' but British slang gradually loaded it with contempt over decades.
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