Getting followed around by a creep. Someone who continuously stalks you
Twyla: You just summed me all around this party!! who are you?!?!
Alex: You're just so pretty.........
by chiccalovee May 22, 2011
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 5, 2008
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
A joke name for the popular canadian pop-punk band Sum 41. Originated in the video to 'Still Waiting', where the executive (presumably) of their record label felt that 'Sum 41' was out and 'The Sums' was a better name for the quartet.
- The reason I called you guys in is that the number band thing is, out, ok?. What's in now is 'the'. The Vines, The Hives, The white stripes, this isn't new. Listen; 'The Sums'? Right?
by Hajen November 22, 2007
To figure out your chances of having sex with your partner or on the first date.
Guy #1: Dude did you nail her.

Guy #2: Not yet I'm still summing
by T.I.T.O May 16, 2009
Sums is an acronym for Spontaneous Uncontrollable Masturbation Syndrome. Sums is caused by puberty, boredom, lack of action, high sex drive, hot people, ect. It is characterized by spontaneous and uncontrollable masturbation, often at inappropriate times such as at the park, when voting, or in line at the bank.
-"OMG look, he's doing it right there!"
--"He can't help it, he has sums"
-"he's my hero..."
by Mark Manivol February 24, 2008
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 7, 2010