When a user in a message board, instant message, chat room, or email uses nothing but capital letters. The said user often uses bad English and internet slang and is often looked down upon as a newb.
User1: OMGWTFBBQ. THIS IZ TEH SUX.
User2: What?
User1: LOLOCOPTER. MY UBER-OVERCLOCKD GAMERZ RIG IS HOTTTT.
User2: Stop having a capslock love affair you noob.