The 1337 alternative way of saying "MacBook" or "MacBook Pro."
I just went to the Apple Store and picked up a 15" HackBook Pro!
A portable PC "hacked" to run OSX86. A Hackbook is the equivalent of an Apple Macbook, and a Hackbook Pro is the equivalent of an Apple Macbook Pro.
Alex: Dude, I just installed Leopard on my HP laptop! It's like the most awesome Hackbook Pro ever!
Mike: That's freakin' rad, too bad your WiFi and sound doesn't work though...