Prt = Portal (A Mage-class player can create portals for other players to use)
2 = to
Org = Orgrimmar (a major city)
1g = 1 gold (currency)
In this case a player is requesting a mage to teleport them to another city, and is willing to pay 1 gold. (Since the latest patch, most portals usually go for 2-5g... sometimes I even get 10g on the Eonar server.)
tbl = Table (A Mage-class player can create refreshment tables for other players)
plz = Please
A party member is asking a mage to create a table that they can use for food that replenishes health and mana.
Ned = Need
1g = 1 gold (currency)
Someone needs money. Usually you'll see this from the lower players asking higher players for money.
Can u rn me thru RFC? 10s
rn = run (a process where a higher-level character parties with a lower level character and then proceeds to do a low-level quest or dungeon so that the low-level character can complete a quest or get an item without doing any work)
RFC = Ragefire Chasm (a dungeon for a group of low level characters)
10s = 10 silver (currency... 1g = 100s)
A low level character is asking a presumably higher level character to do the dungeon for them, and is willing to pay 10s. (10s is nowhere near the price anyone would pay for a run. Hell, you'll pick up a few gold in the dungeon...)
Now you know, and can be nerdy like us. Just like us... Just like us... Just like us...