"Slap af!"

Translation: Relax!

[LucBE]

Gør det ikke!

[Zylbath]

In German: Schlaff ab? HAHA

[Olweg]

I was first wondering if it wasn't something like... "F**k off" lol

[AndrijAndrusiak]

what is this about?

[Thorfinn1]

I also think you need to accept "chill out" or "calm down" for this...

[bamsetopper]

I think 'slap af' is more like when you're taking a load off, and less about calming down from excitement.