Takk for sist!
Literally means “thanks for the last time” (we saw each other). You would say this to a person you have met before and it’s an important way to maintain a good connection with the person. It’s a way to acknowledge your last meeting and say that “we had a fun time”. We wouldn’t use this to our close friends we often see, but maybe a person you haven’t seen for a while.
Takk i lige måde! / takk det samme!
This would be your response to many “thank-you sentences”. It means “likewise”/”the same”. For example if a norwegian says “takk for sist”, you can show off by replying “i lige måde”.
Takk for alt!
Be a bit careful with this one. It means “thanks for everything” and is used at funerals as a farewell to the deceased. Not the best way to end your date night.