L33t D00d appears as Kliff Undersn from Guilty Gear.
"Mega world rockage, dude. Mega."
Sensei = teacher
"Sensei? This sexa lil Japanese chick your student?"
"The win dude."
"Hey babe, you got to make with 632146S for max beats."
632146S is not l33t, but shorthand for the control motions that activate Jam's Chokyaku Houoshou attack. The numbers designate joystick direction and correspond to the number keypad on a PC keyboard. S is the slash button.

Dom speaks:
Also, just want to make sure people notice that some of the cards floating around in the first panel have been cut in half. It's the little things that count :)