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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."
by idunnoit August 18, 2007
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2
Another way of saying "Oh, hi."
by Zachary B July 13, 2008
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3
A greeting that has its origins in what is arguably the worst movie of all time: The Room (2003). This phrase is said about fifty times in the movie by various actors to various other actors, and very often at random, inappropriate times.
Johnny: I did not hit her, it's not true! It's bullshit! I did not hit her! I did NOT!! O hai, Mark.
by Leine-lu March 11, 2011
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4
a way of saying hello to a good friend, or a way to weird out an acquaintance.
Girl 1: "Hey Matt"
Matt: "OHAI"
Girl 1: "..."
by pretzelz January 22, 2011
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5
A word used in conversations or online games - an alternative for "oh, hey" - but makes you sound even more fucking retarded.
retard fail omg lol ohai
by Verticity September 29, 2010
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The vengeful act of crapping on a lover's chest while they sleep.

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6
The Literal meaning of Ohai is unclear, but Ohai means "place of the stone" and this name was in use for the area before the coal mining or town was established. It has been noted that Morley stream near the town was previously called Ohai It is likely that the area was originally named in relation to a Maori stone quarry that is nearby.
Ohai, It's a town you dick.
by ohailander January 25, 2012
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The vengeful act of crapping on a lover's chest while they sleep.

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7
small boring town in california bordering on a tiny luddite college on a hill

(correct spelling: ojai)
girl 1: the best part of my day is shovelling shit at work
girl 2: shouldn't going home be the best part of your day?
girl 1: no, I live in ohai
by share the harp is February 17, 2012
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