ko tāua/tātou (katoa) tēnā
1. that's us, we're for that, we're into that, what a good idea, count us in - an idiom used to express agreement or support for someone else's statement or suggestion.
Tātou ka haere ki te pikitia. Ko tātou tēnā. Hoake tātou. / Let's go to the movies. What a good idea. Let's go.