Refers to the Motorola Dynatac 8000X cellular phone. The enormous, gray, brick-sized phone was popularized by the character Zack Morris in Saved by the Bell. This was the first cellular phone to receive FCC acceptance in 1983. DYNATAC is an acronym for "Dynamic Adaptive Total Area Coverage."
I'd give my left nut to rock a huge-ass Zack Morris phone. Let's hit up ebay!