Usually pronounced when mumbling. The description of weed when talking about it in public. can also be said while making a "2-puffs on the joint" gesture
Example 1:
The Boy: Yo dog, whats good?
The Man: Nothin. What you doin?
The Boy: Not shit.
The Man: You wanna go behind tha dumpster n smoka lil bitter dat sum sum?
Example 2:
Tina: Do you smell skunk?"
Ed: Skunk? You talkin as in the animal? Or you talkin bout you smell sum sum?
The Boy: Yo dog, whats good?
The Man: Nothin. What you doin?
The Boy: Not shit.
The Man: You wanna go behind tha dumpster n smoka lil bitter dat sum sum?
Example 2:
Tina: Do you smell skunk?"
Ed: Skunk? You talkin as in the animal? Or you talkin bout you smell sum sum?
by Morbyd West July 9, 2010
 Get the Sum summug.
Get the Sum summug. 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
by sum loser March 18, 2005
 Get the summug.
Get the summug. by Haley Hazardous April 27, 2009
 Get the sum summug.
Get the sum summug. by HiItsMeHaHa December 20, 2017
 Get the summug.
Get the summug. by Matt Smith August 4, 2004
 Get the summug.
Get the summug. "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!
Dude: SUM bitch!
by Glasstt September 1, 2011
 Get the SUMmug.
Get the SUMmug. 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.
by Snap-Zurmii13 July 9, 2019
 Get the Summug.
Get the Summug.