Shoosh is a nickname that can be applied to your soulmate, your person, or the love of your life. It can be used as a pet name or as a quick addressing term.
When someone on an opposing team is losing in multiplayer and 'actin' a fool.' But they still talking trash. You exclaim this phrase to put 'dem busters' in their place. And silence them mofos.
Theo proclaimed loudly, "shoosh yo shit!" To them annoying fags on the other team over his headset.