Nah Sayn - A fancy way of saying ‘Are you even half smart?’ Used when y

A fancy way of saying ‘Are you even half smart?’ Used when you think you’re cool but your homies are just pretending to listen.

Nah Sayn? I just told my dad I’m richer than him.

Nah Sayn? I just said I’m gonna beat up the mayor.

Nah Sayn? I just got a girlfriend who’s my cousin.