A request that the listener/audience waits until they have heard all the information before voicing their
opinion. Often
said when the speaker anticipates that what they are about to
say will be prematurely interrupted, dismissed or ignored without allowing the full story being told.
Family
Guy: Brian & Stewie (S08E17)
Stewie: Look, I’m going to propose
something and I need you to hear me out. Will you
promise me you’ll do that?
Brian: I guess...
Stewie: You guess? Or you will?
Brian: Yes I’ll hear you out.