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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?
Sum sum by Morbyd West July 9, 2010
Related Words
Me: We're Gnna hang out over sum sum, yeah?
You: hell yeah.
sum sum by Haley Hazardous April 27, 2009
a underground word for a girl's period.
Girl1: Are you okay? You seem pissy.
Girl2: i'm on my sum sum
Girl1: ohhhhhhhhh
sum sum by xXFuckPrettyXx September 28, 2008
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.
sum-sum by Sarah Lambert March 5, 2008

sum sum ig

an instagram account made by a boy where he posts pictures of himself pretending to be a woman
look at him, he's posting for sum sum ig again!

A lil sum sum 

In meaning of small amounts of money.
I will give you a lil sum sum.”
A lil sum sum by Tutu202 October 6, 2019