An incredibly easy strategy used by terran players in the game Starcraft 2:Wings of Liberty. The bioball is unstoppable when it reaches critical mass. It is only beaten early on through sheer skill or a bigger bioball.
It is considered a tactic used by noobs and is sometimes considered to be overpowered. The bioball takes the least amount of skill possible for an RTS game to use.
I got bioballs of steel.
That f***ing bioball is overpowered.
Bioball A-click to victory.