If you have pvcs in both the left and right ventricle is that called multifocal pvcs?

Not quite the same: Multifocal pvcs means multiple areas in the ventricles of the heart that are firing to stimulate contraction early (premature ventricular contraction). The can be in different parts of either the right or left ventricle, or both. So, having pvcs originate in both ventricles would indeed be multifocal, not all multifocal pvcs are from both ventricles. And not all pvcs are bad! often common.