用的可都是外姓人啊!: ''All the people whom you use/hire are outsider! '. Sometime, we think those people who have the same last name as us are on our side. '外姓' means they have different last name. '用的' means 'something/someone you use or hire'; ''可都是' means 'all (of) ... be', such as: ‘这些蘑菇可都是可以吃的？’/Is all these mushroom eatable?