First, I got it as : I am totally cooler than you noobs/newbies."
Second, I guess that the way it is written reflects a taste of locally intimate relationship: I am one of you folks.
But only a guess. You opinions will be appreciated.
A simple, undefined reply when an ignorant comment or action is made. Brought to life in the South Park series, when Mr. Derp made a guest apperance at South Park Elementary as the chef for a day, followed by hitting himself in the head with a hammer and exclaiming "Derp!"
I am t0tally c00l3r than 7u n00bs.
We prefer to spend our time answering questions on standard English here, NewHopeR.
You could ask this question on Twitter.