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
This page explains what the abbreviation "sum1" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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Baseball Slang Quiz: Can you bat 1.000?
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.