woot = yay. I use it sarcastically. Came from D&D (dungeons and dragons) from the combo, "wow, loot"
smh = shaking my head
There's also owned, pwned, ownage, etc. Used when you completely dominate something. If someone hacked inr, then inreview would = pwned. And if you did that, then you'd be a l33t h4xor (elite haxor -hacker)
And anyone foreign to IRC (Internet Relay Chat - a server-based chat program that preceded P2P programs like AIM & ICQ which is still actively used today) you might see someone do something like this from time to time:
In IRC that command would display an action message preceded by your nickname so the other user would have seen "Sean Kelly hides". Only true IRC addicts or recovering/former addicts will carry this type of notation over to other types of messaging.
And for those of you who don't and will never have anything to do with coding, sometimes you may see geeks write somethnig liek this:
s/somethnig liek/something like/
which is a regular expression (coder jargon) that tells the program to go back and substitute the type-os with the corrected versions.
there're search engines around the net... basically you just type in what you're looking for and it'll find some bots that are sharing it. Generally you'll have to download a whole album, though, rather than an individual song, unless you search fservers... but they generally suck now (about a year ago they had an awesome amount of content)
here's some lingo (to keep ontopic...) :
MSG - message
Well there are a lot of ways of spelling noob, newb, nub, boon, etc. It's mainly to get around the servers. They block certain words out so if you change the spelling around then it will pass through the filter. Thats also why owned can be pwned. If you didn't notice the p key is next to the o key.