Top definition
1. The tradition of repeatedly saying or writing "Oh My God!" at any given place or time.

2. Typing the acronym, OMG on the internet daily.

3. A popular gesture or facial expression of being excited or surprised by 1 or more things.
OMG Meme is 1 of the most used internet memes and gestures in the world, as we know it.
by internet-memes.blogspot.com September 29, 2012
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