The shaggy hide you probably found is a misprint. Its actuallly supposed to be 2 separate skills.
Titanic Strength: The model may wield double handed weapons in one hand, this allows the model to have two double weapons or a shield and one double weapon. The strike last penalty is still in effect though.
Shaggy Hide: The model has a scaley skin save of 6+, this can be combined with armor and a sheild. Example, a beastman with light armor (6+), Sheild (+1 to you save) and shaggy hide (6+save) has a total armor save of 4+.
