Just some background (for those who don't catch the funny part of the vid)
DKP = Dragon Kill Points
How it works is:
If you kill a boss and 4 items drop...
You are allowed to bid a maximum of 150DKP on an item you want, but generally start off low. If someone else wants it too, the bidding will go from 10 up to the max amount that someone is willing to / or able to afford.
DKP is like money...you pay for the item you want, highest bidder gets it. But you don't pay the boss - since you killed him. So if you were in a 10man group and you bid 40DKP on an item, every person in the group gets a 10% share (= 4DKP) of the DKP you spent.. even YOU. So you bid 40, but only lose 36.
DKP also has a credit rating, you can have 0DKP to your name and still bid. However you're capped at -150DKP, so if I have 100DKP to my name and you have 0DKP - and we both bid 150DKP on an item, I will get it, since I have a better credit rating with the bank than you.
It's a very fair way of distributing loot - as you save you DKP for that special item you've been wanting for. Also, when you help kill a boss and nothing drops for you, you still earn DKP whenever anyone else bids on the items that dropped.