Top Definition
When you post a comment on a youtube video, usually of a popular musical artist, leaving an unflattering comment and expecting to argue with many fans of the video/artist in the future.
"Man, I tossed a youtube grenade yesterday leaving a comment on that Taylor Swift video. All I said was that her singing was terrible and instantly I my inbox was flooded with people insulting me."
by MarcoGTR February 13, 2012

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