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It's what you say when you don't know what else to say to someone, and you're thinking "Wtf", but they're your friend and you don't really want to sound mean. If used with authority figures it can also mean "Fuck you".
Amy: So, I made out with Bob last night.
You: Oh.

or

Mom: You need to clean your room.
You: Oh.
by fanofthebeewhisperer September 25, 2010
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2
something one would say to show how much they really don't care
-omg my dog got hit by a car today, my teacher slapped me, and my boyfriend broke up with me!
-oh
by veggieness April 05, 2005
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3
A way to reply to a statement when you can't think of anything good or helpful to say back.
-I think im going to fail out of college and have to move back home.
-oh
by What in Tarnations? October 16, 2006
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4
1) A question such as "for real", asking for truth or reassurance
2) An acknowledgment
30 A universal word for any and every situation
1)A: I got an A the semester
B: Oh?
2)A: Dinner is ready
B: Oh?
3)Either a friend or a person of whom you despise walks by, you say "OH!?" very loudly OR some idiot drops a box, you hear and/or see it and say "Oh?"
by The Accused Union April 11, 2005
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5
What you write in a text when you are actually hurt by what someone says.
Crush: "Lol sorry i was w/ Jenny yesterday."
You: "Oh..."
by blah.isaidit. July 18, 2011
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6
An original hippie like an OG (original gangster). Not a fake hippie who condones violence and says their part of the "family". Prefers to promote peace and envirmental causes.
He's an OH he sells drugs to make people happy and isn't concerned with making money.

"Wow that's allot of pot you got growin,you Gunna be rich"
--"nah I'm just Gunna smoke and share it all"
" ah..OH style"
by Jasminepeach August 23, 2012
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