Here are some useful phrases.
- Ungi maðurinn þekkir reglurnar, en gamli maðurinn þekkir undantekningarnar.
“The young man knows the rules, but the old man knows the exceptions.”
- Nú duga engin vettlingatök.
“No more mitten-takes.” — used for: Do it right this time.
- Ég kem alveg af fjöllum.
“I come completely from mountains” — used for: I have no idea what is going on
- Ég mun finna þig í fjöru
“I will find you on a beach” — used for: Don’t make me hurt you. Sort of.
- Að koma einhverjum fyrir kattarnef
“To put someone before a cats nose.” — used for: Putting someone in the spotlight, but slightly more dangerous.
- Ég borga bara með reiðufé
“I only pay with an angry sheep” — used for: Okay, but I don’t have to like it.
Edited to add: I put in rough ideas of how one would use these phrases