(GOB 'lin boks) n., slang. Any kind of device (computer, PDA, cell phone, GameBoy, iPod, or television) that relentlessly sucks up all of your time and attention. If you're reading this, you're utilizing a goblinbox right now.
You might have a S.O. who wishes you weren't pasted to the goblinbox who's hollering, "Turn off that blasted goblinbox and come to bed this very instant!"