You just got seated. It doesn't matter how many h's in "Ohh" there is, just more than one.
A response to any insult directed at someone around you
Person 1: "The world would be a better place without you"
Person 2: "OHHH HE SAID YOU AINT GOT NO NIPPLES!!!!!"
The catchphrase of the Knights Who Say Ni {Monty Python}
"We... are the Knights of Ni. Ecky-ecky-ecky-ptang-zoop-boing-bigwam-ohhh!"
To answer the other poster, that song is baby by justin bieber. It's the most infamous line that can cause malignant cancer to anybody who listens to it.
*walks in*
Dad: Hey son watcha doin, wait a minute isn't that Ba-
Bluetooth speaker: AND I WAS LIKE BABY BABY BABY OHHH
Dad: Well fuck, now I have cancer.
An expression of annoyance or irritation, can also be used for something funny
“Your so annoying””OHHH MYYY!!!”
What you say when you have premature ejaculation