To announce that you are ignoring someone electronically. From talk.bizarre on usenet, meaning the sound of an unruly newbie being added to a killfile. Also plonker - one who deserves plonking. Example: You're so fulla crap. I'm never reading another line of your drivel. PLONK!
PLONK
Meaning of PLONK in English
Slang English vocab. Английский сленговый словарь. 2012