To be in a state of deep thought or in a state of trance.
"Man I was rolling so hard I was ASOT (asoting)"
"Dude, are you alright? You seem out of it.
-Nah man, i'm just asoting. Fer sure."
"So Fucking Over It" i.e. exhausted, tired of the same thing, annoyed, etc. Pronounced: suh-fo-ee
"Dude, Derek, I have four finals to study for, a term paper due tomorrow, and two books to finish - SFOI"
Derek: "Yeah man, I had the worst customers today at work. Just one of those days, SFOI."