The technique simply refers to the Genesis's ability to do very fast DMA transfers, most especially during the vertical refresh, which allowed the system to "blast" memory to the screen. This was notably used on the Sonic games, which gave them the ability to have much faster horizontal movement than would otherwise be possible.
Guy 2 : This is what happens when the marketing department talks to the programming department.
SNES Fanboy: How?
Sega Fanboy: Um.. It just does, geez, watch the commercial.