O Hai 

The phrase is an intentionally misspelled "Oh hi" and is usually used as a title on cutesy pictures of animals like on lolcats.

The phrase is often followed by a short, badly spelled sentence as if the animal/subject in the picture is talking to the viewer.

O Hai may also refer to these types of cutsey animal images in general.

Picture of kitten in a stack of business reports.
"O Hai, i am bein yur nu secritary. Get me cofy."

O Hai by idunnoit August 23, 2007

o hai thar 

Another way of saying "Oh, Hey there!"

As started on the freenode network channel #tyreus

Ambur has joined #tyreus
<Brad_R> O hai thar, Ambur!
<Ambur> O hai!

o hai thar by BwaddArr / Monkie / MrMonkie January 16, 2010

Có khi nào ở nơi đâu đó nhìn về quá khứ của hai ta 

Instead of Rickroll, you play this cringy vietnamese song to raid the discord Elites server made by Admin 'Supreme': Gobble, aka 'Patrick Hanoi'.

Patrick: What sup guys today we playing Roblox with our friends.
Probot: /play: Có khi nào ở nơi đâu đó nhìn về quá khứ của hai ta, em có, biếttttttttttttttttttt...ớớớớớớớớớớớớơợớớớ.

Có khi nào ở nơi đâu đó nhìn về quá khứ của hai ta by DucHuy-peasant February 28, 2022

Harrison O’Hairy 

a very silky ginger man, who is extremely hairy. He also enjoys stealing crackerz and consuming them. His lastname remains a mystery.

wow look it’s Harrison O’Hairy i wonder whose crackerz he’s eating today!!

Harrison O’Hairy by Poxford111 July 12, 2020

a rag o' bone and a hank o' hair 

An extremely emaciated individual.

Good lord, she's just a rag o' bone and a hank o' hair - a stiff wind would blow her away!

a rag o' bone and a hank o' hair by Rod Brock September 24, 2005

Madalyn Murray O'hair 

a angry atheist activist, now deceased. She traveled the nation to proclaim the non-existence of God. And she hated religion. She wasn't just an atheist. She was really, really mad about it. And she was an aggressive woman. And a real Large Marge. Even Ayn Rand, herself an atheist and angry as well, disdained her.

She went missing for over a year and finally turned up murdered.

Madalyn Murray O'Hair, you sure are an angry atheist, you crazy bitch.

Madalyn Murray O'hair by Frank Booth January 9, 2005

O'Hair line 

looking beyond the the common five-head, this gleaming forehead giganticus is so large it was named after the massive Chicago airport because you could easily land a 747 on that vast skinscape.

Who is she kidding? Bangs can't hide that O'hair line of hers.

O'Hair line by MedicalMatt September 29, 2010