A term used to describe someone who OVER-uses RuneScape and continuously talks about it.
<Rsn>"Come meet me at lvl 49 wildy and we'll go pking"
<Me>"No, shutup you fucking rsn"
(nerd who practically lives for the computer game)
"Omg! You're still on you rsn"!
<Rsn>"Check out my full dragon, obby shield and fire cape =)"
<Me>"Shutup you fucking rsn"
Strengths: team loyalty, blind faith and snow shoveling prowess
Weakness: wicked bad driving manners