1. Another way of saying seen
, basically meaning "i see" or "oh right"
2. If someone says something contreversial or something you don't agree with, you say it in a disgusted tone.
Person one: wuu2
Person two: nm
Person one: nm, babysitting, my rents
gone out so i gotta look after my sister
person two: skeen
Person one: i heard you were flirting with that girl
person two: skeeen, she was flirting with me!