The word 'wait' is often used today as an interjection, in the same meaning and manner as 'wait a minute'.
Friend 1: Hey I heard there was gonna be a big food banquet today?
Friend 2: Nah I lied lol
Friend 1: Wait, are you telling me I came to church for nothing?
Hym "Did you see me dodge that hospital trap? Obviously a trap. That's why I wait. The Russell Brand thing too. I waited on than and now I am the good one. I always was the good one but I waited real good as well. So there's that."
She kept giving me the polite brush off until I walked away and opened the door of my whip, then suddenly she got gold digger patriotic: "Wait, is that your car?"