Most likely used by some corpies playing Eve Online. Typically relates to ridiculous fits on ships but the term stems from people mining in asteroid belts and getting helplessly ganked, lulz.
"Dude! I just lost command ship!" "Why?" "...I fell asleep on the gate..." "lulz, Noobranium!"
"Hey, I hear theres tons of noobranium on the ice belt right now" *Smartbombing battleship dives in to the rescue*