This may have a context of challenging the other team or perhaps telling them that this is what we do, what are you going to say about this and so on. Or may be you can have something on the lines of "Say hey, hey, boom-a-shaka-boom-a-shaka, hey, hey, boom-a-shaka-boom-a-shaka" (stomp feet and clap thighs and hands on the boom-a-shaka phrases).