The act of achieving Level 10 in Evolves FFA Choice before anyone else(A UMS game variant for Starcraft), and using the Ultralisks to "sweep" through the much weaker ground units that your opponents have. Also known as ultra sweeping, sweeping, sweep, etc. Popularly used by TeHNeWBON.
Dude, this guy got 400k points way before me, and started Ultralisk Sweeping me.