Another term used in the place of awesome. It can also be used when one agrees with something someone else has said, or agreeing to something. In agreement the word is said as unenthusiastically as possible, yet a nod is crucial. Is pronounced something like: waance
Girl 1: I got the new Coheed cd
Girl 2: Once!
Bob 1: Hey you coming with tonight?
Bob 2: Once. Like I would miss it
Guy 1: That movie was so gay.
Guy 2: Once.