I have seen some references to the term, "ragequit". Being somewhat new to SO, I am intrigued. What exactly does ragequitting entail?
Rage quitting is when a user gets extremely angry about something—probably trivial—then goes on a rage and makes malicious edits, deletes their useful content, etc.
And then quits.
It creates a lot of work for the moderators to un-do the damage, and as a result there are mechanisms in place to try to mitigate the damages: edits cause a question to bump up in the relevant active pages, you can't delete more than 5 of your posts in one day, etc.
In the context of SO, I suppose it would mean that a user is enraged or angry at something about SO and decided to never ask/answer at SO again.
Needless to say, it's a bad idea.
It just means that someone gets really angry during a game/argument/etc so they just rage at everyone and then leave.