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1.
A little something.

Sometimes a little something extra.

Used many different ways to imply a variety of things including drugs, sex or sexual acts, money, etc.

Can be used to describe almost anything you want a little something of.
I called my dealer up for a lil sum-sum to take to the party.

She was so wasted that she drunk dialed her ex last night for a lil sum-sum.

I told him to throw a little extra sum-sum into the sack I bought since I am such a faithful customer.
by Sarah Lambert March 05, 2008
 
2.
having sex..like getting sum from somebody
dude: wat did you do last night with that girl
dude1: dude i got sum sum last night
by walkersss May 19, 2009
 
3.
Summer.
Me: We're Gnna hang out over sum sum, yeah?
You: hell yeah.
by Haley Hazardous April 26, 2009
 
4.
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?
by Morbyd West July 07, 2010
 
5.
a underground word for a girl's period.

Girl1: Are you okay? You seem pissy.
Girl2: i'm on my sum sum
Girl1: ohhhhhhhhh
by xXFuckPrettyXx August 03, 2008