The most important word in Finnish

Jeremy showed me this video (https://www.facebook.com/expatfinland/videos/581734538686503/?autoplay_reason=all_page_organic_allowed&video_container_type=0&video_creator_product_type=2&app_id=2392950137&live_video_guests=0), which is a comedy bit about the most important/common word in Finnish (only watch until 3:40). There is also this, about the same word:

Do we have such a versatile word in English? Maybe something like 'so'?

I read somewhere years ago that 'dude' might be the closest thing there is to an all-purpose word in English. Depending on intonation, it can mean anything from "awesome!" to "what. have. you. done??"

No niin really is useful in Finnish, though.