plonk

excl.,vt. [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.