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1.
The number one in place of an exclamation point at the end of a sentence.

This occurs when someone is "screaming" in all caps but forgets to use shift for the exclamation mark.

Writing in all caps and using the number one for emphasis.
COMPUTER BY OFFICES. SLUGGISH AND STUPID111

I was so angry I used screaming ones.

YOU SUCK111
by pkwatz March 22, 2010