threadkill

to put a negative or stupid comment on a persons facebook thread. Particularly when the topic or "thread" is upbeat and funny. A threadkill will usually bring a halt to the conversation. A threadkill can be used as a noun or a verb.
facebook topic starts: What a great day the weather is awesome
Comment 1: gorgeous 80 and sunny
Comment 2: We have a little rain but life is good!
Threadkill: I can't go outside ever because I get sunburned and I have allergies
by simonayes May 13, 2010
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a biting wit seen on facebook that effectively kills the thread, regardless of topic. 45 comments might be flowing freely on a thread, and then this person comes in, and either through wit, political incorrectness or pure non sequitur, prohibits anyone else from posting to the thread, effectively 'killing it'
dude did you see that thread that john had on his page?

yeah it was great until that guy posted the cameltoe pic!

i know, what a threadkiller.
by jerry potter April 6, 2011
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