What is Oh No?
1.
An exclamation of horror and shock, negatively looking at an outcome.
<kid 1> I beat up your little brother, stole his lunch money, and hung him by his neck over a fiery pit of doom.
<kid 2> Oh no!
2.
A phrase you don't want your girlfriend to say at anytime ever.
1) Lisa: "Oh no!"
John: "WHAT?"
Lisa: "I'm pregnant!"
See
3.
Explanition of slight shock to an event.
Fox announcer: Heres fox in HD
(show highly detaled image of hideous lady who was smokin hot before the change)
Griffin family: AH!
Qaugmire:AH!
Cleaveland:AH!
Bruce: Oh Nooo.
See
4.
A way for an onlooker to spark up a fight between two people after a cuss from one person to the other.
(Note: Nuff respect - Knee AL)
Dan: What you looking at?
Thomas: Your mum!
Onlooker: Oh No! (O-NO!)
(sometimes followed by ..."OH NO, SERIOUSLY!)