Sum1
Someone
Example
I heard sum1 got 100% on the test, though I don't know how that is possible
sum1 definition by Slang.net - The Slang Dictionary
This page explains what the abbreviation "sum1" means. The definition, example, and related terms listed above have been manually compiled and written by the Slang.net team.
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Sum1 is a creative, unusual way to abbreviate "someone." Sum1 who sends you this abbreviation is likely a master chatter, who wants to show off their text-fu.
Now that you know about sum1, you can use it yourself in text and chat messages. That way, all your friends will think you're super kewl.