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a lazy persons way of writing the word 'some' also one of those idiot who likes making things shorter by taking of the last letter of last few letters
some = sum
dumb = dum
some = sum
dumb = dum

person1:'whos that?'
person2:'oh, its just sum dum idiot'
sum by sum loser March 18, 2005
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"Some", but retarded. Also the result of addition.
i had sum kake and i smurt
The sum of 2 and 2 is 4
sum by HiItsMeHaHa December 20, 2017
Related Words
summer sum 41 summer teeth Summit sumbitch Sumi sumo sump Sumaya sumit
"and then, this guy sum, started crying like a big teddybear"
sum by Matt Smith August 4, 2004
"SUM" is a shortened direct command with a meaning similar to "be quiet"', but which is commonly perceived as an angrier and more forceful demand to stop making noise or otherwise communicating. The phrase is probably a shortened form of "shut your mouth up", and its use is generally considered impolite.
Laura: I'll really hate rain, it scares the hell out of me. I mean were does it come from, can you drink it?

Dude: SUM bitch!
SUM by Glasstt September 1, 2011
It can be used as something or as some but really mostly to get booty pics from a girl or said when you got some pussy.
You heard that will got sum last night?

Hey wanna send sum?
Sum by Snap-Zurmii13 July 9, 2019
'really' or 'very'
'thats sum cool!' or 'hes sum hot!'
sum by i have no life May 15, 2005
A guy with a huge mule who likes to talk dirty to women.
Look at Sum, he's a stud.
sum by Sum's Lover November 12, 2003