Jås is another word for the phrase "yeah, right". When using jås, you are stating in an ironically way that you do not agree with whatever a person just stated.
Jås is primarily used by Norwegian people living on the island Askøy.
"Arbeiderpartiet is going to win the national election in 2013!"
"Eirik Krokås is not a heavy drinker!"
Norwegian: "Ute med de beste, god kok på byen. YOLO!"