1 definition by KittyLove4Days

1. The moment of realization.
2. What you say when you didn't care what someone said and/or you weren't listening.
3. Most people say it when they're hurt.
4. A sound of surprise with joy.
4b. A sound of surprise with disgust.
1.
Me: "What's 2+2?"
Little Brother: "Uhhh, I don't know."
Me: "4."

Little Brother: "OH."
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2.

Friend: "OMG GUESS WHAT?"
Me: "What?" *stares off into space*
Friend: "BILLY JUST ASKED ME OUT."
Me: *blinks and looks back at her* "Oh."
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3.

Me: "Actually, Billy was asking Carmelita out."
Friend: "oh..."

4.
People: "SURPRIIIIIIIIIISE!" *reveals surprise party*
Me: "OH! Thank you so much!"
4b.
Little Brother: "Hey look in my tissue!"
Me: *instictively looks over but cringes* "OH...EWWWW."
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by KittyLove4Days June 28, 2017
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