Cobra-la-la-la-la-l a-la!
So what exactly was that battle cry supposed to do? Incapacitate the Joes while they laughed at its sheer ridiculousness?
Either that or;
Serpentor: Cobra-la-la-la-la-la (Meanwhile GI Joe slaughters everyone)-la ... gawdammit!!! Why didn't we just stick with Cobra?!