Sorry but I still find this quite hilarious lol. Transcript & translation for you:
[Side note: Just moments before this clip started Stefan said, in Swedish, “Welcome to our 20th birthday party! Should we celebrate some?”]
Stefan (in Swedish): The funny thing is, he doesn’t understand anything (points at Brian)
Brian: I only know how to say rude things in Swedish.
Stefan: Do it!
Brian: Yeah, I’m not going to insult the audience.
Stefan: Talk to me!
Brian (in Swedish): Uhhh… ah! Lick my ass!
Stefan (in Swedish): Nah, not today.
Brian (in Swedish): …goddammit.