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1.
The opposite of a ragequit.

When a person joins an IRC channel or game server pissed off about something and starts making threats and demands and asks to see the admins immediately.

Usually about 99% of the time results in said person getting egged on and trolled (or made fun of) by the people in the server, then either them getting banned from the server by an admin or trolled so hard that they ragequit.
Here is a made up example of a ragejoin, typical of what you'd see in an IRC channel.

*** user001 has joined #channelnamehere
<user001> Who THE HELL banned me from the forums?! I want to talk an admin right now!
<someone> guy2: yeah I know what you mean dude
<user001> Shut the f**k up and listen to me. Where is the admin?
<someone> lol what?
<someone> dude, i'm the admin. sup
<user001> okay listen you stupid son of a bitch, unban me right now or i am going to hack your website and bring it down
<someone> okay you're unbanned
<user001> ok
<user001> ...
<user001> i'm still banned
<someone> yeah i lied i'm not the admin
*** user001 has quit IRC (FFFFFFFFfff)
*** admin sets mode: +b user001's hostname
<someone> lol
by dentonunatco March 25, 2009
 
2.
Opposite of rage quit. The player joins a server in rage, and proceeds to own everybody as a form of stress relief.

Also when someone who has just recently rage quit, rejoins the server still raging, in order to lash out at the person who made them quit.
EG1

lost_e: FUCK, i am so pissed off right now, im gonna go play some TF2
Dude: Ok dude, meet you on there soon

*hour later*

Dude: Holy shit! You went absolutely mental that round, must have been your rage join.

EG2

*Bob has disconnected*

Dude 2: Haha, what a little bitch, fucking Rage Quiter.
Dude 1: Yeah, what a bitch, you only shot him in the face about 5 times.

*Bob has joined the game*

Bob: FUCK YOU ASSHOLE AND YOUR MOTHER AND FATHER IM GONNA RAPE BOTH IN A FIRE, etc etc.
by lost_e November 02, 2008