The other Jargon File states
[Usenet: possibly influenced by British slang ‘plonk’ for cheap booze, or ‘plonker’ for someone behaving stupidly (latter is lit. equivalent to Yiddish schmuck)] The sound a newbie makes as he falls to the bottom of a kill file. While it originated in the newsgroup talk.bizarre, this term (usually written “*plonk*”) is now (1994) widespread on Usenet as a form of public ridicule.
It strikes this Brit that the phrase is more likely to originate from the British slang "plonk" for "toss something aside carelessly in a heap".
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