The long 'Oh' is usually used in order to emphasize offense in and caused by people you have never met. Often shouted loudly to cause extra discomfort.
Jim: You know the one thing bigger than my penis?

Joe: Your mom?

Random asshole: OOOOOOHHH!

Jim: That was funny until what's 'is face over there pulled 'The Long 'oh''
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A game named after the phrase spoken during play. An individual stands in a potentially dangerous location and counts how many times he can say "Oh Long Johnson" before moving out of harm's way. A primitive form, involving a train, was made famous in the 1986 film Stand by Me.
Jerry: Hey, get out of the way, Corey, that train's gonna hit you!
Wil: He's playing Oh Long Johnson.
Jerry: What?
Corey: Oh Long Johnson! Oh Long Johnson! Oh Long Johnson! Oh Lo---
by froggypriza March 31, 2012
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Made popular by a talking cat, it is an expression made to show exasperation or surprise.

Alternatively, it can be used after you tell a joke. Like a "oh, snap!" type of thing.
Guy 1: "Have you paid the rent yet?"
Guy 2: "Oh Long Johnson...nope I haven't yet."

Guy 1: "Hey did you hear Jill is going to be at the party tonight?"
Guy 2: "No, but that's cool."
Guy 1: "I heard she's single now."
Guy 2: "Oh Long Johnson..."
by Sociopanda January 12, 2012
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a jamaican term for somthing dated in the 19's.
guy:oh blood,whats with the shoes? there from fucking 19'oh long
guy 2 who is wearing the shoe.'your fuckery man allowthe shoesi'm beating.
by xXx gyal June 1, 2005
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A term used in the show: South Park as a type of meme in the episode "Faith Hilling". This meme is portrayed as a person continuously saying "Oh Long Johnson" in a dangerous situation.
A boy was Oh Long Johnsoning in the road. After he said "Oh Long Johnson" for the 5th time. A truck hit him on his Rearend, punishing him for Oh Long Johnsoning in the Traffic.
by thenegativedegree November 3, 2013
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A term meaning so long sometimes used in chat rooms.
S = 19th letter in the alphabet
A- 19'oh long, I have 2 go!

B- k ttyl
by Andrea D. April 9, 2006
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