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.