What does board rage mean?

board rage meaning in Urban Dictionary

Board Rage:Anger outburst on a message board.Usually displayed by incoherent, misspelled hostile ideas typed with "Caps Lock" on.Excessive aggression because of the misunderstanding of some other post. Almost certainly caused by the rager's failure to:a- get a joke.b- understand sarcasm.Facilitated by the fact that many people on the internet have actually a great deal bigger muscle tissue compared to real life.