Oh no is a phrase used to express some kind of negative feeling towards something that happened or if about to happen
For example
Kid: my grandmother just died:(
You: Oh no! That’s so sad
Or…
Random guy: Someone is planning a murder on your wife!
You: Oh no, fuck fuck fuck
a phrase that's used by hannah christie
to eat it, yeah, to eat it?! oh no! no no no
What you think when you miss a phone call by your mom.
“Oh no, I missed 2 of my mom’s calls”
“Lmao”