(ko) tāua/tātou tahi
1. that makes two of us, me too, you and me, that goes for both of us, that goes for all of us, us too - an idiom used to express agreement or support for someone else's statement. Tāua is used when only two people are being referred to, tātou when more than two are involved.
Kāore au i te mōhio he aha te tikanga o taua kupu. Ko tāua tahi tēnā. / I don't know what the word means. That makes two of us.