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Derived from the abbreviation for “Student Union”, an S.U. is a smug, overprivileged young man from a middle class background who attended a private school before whatever costly further education he is currently in.
The sort of person Radio 1 wish their listeners were (rather than 40 year old forklift drivers), he will be studying a subject that is either ridiculously easy or meaningless, will never have had a job and will be financially reliant on his parents, whom he has already cost an astronomical amount.
Dressed in “Surf” fashions), these Prince Harry lookalikes (there are a disproportionate amount of pale ginger ones) blight cities bleating at the top of their lungs at their idiotic flatmates, buying pints of cider on their discount cards before sicking them up over halls of residence balconies.
At some point, borrowing Mum and Dad’s BMW just isn’t enough anymore and said parents will have to cough up for a “Gap Year” (despite the 20 or so he’s had already) wherever he’s heard there are prostitutes and weed. He will return from the trip to loudly tell everybody “What a real eye opener” the poverty he saw there was, despite there being districts not much better off a couple of miles from his parents’ £300,000 semi. In the unlikely event of finishing university, the S.U. will most likely take up work in Subway or Burger King but in some cases will swap his Che Guevara hoodie for a suit and go to work for an oil company or the government.
Geoff: "How did your gig go the other night, Jim?"

Jim: "Terrible. It was a student bar. Just a crowd of up their own arse S.U.'s!"
S.U. by UpYourKilt August 30, 2011
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A slang term used to refer to a girl who's breast area has either reached the point of extreme sagging, or even at a young 20 something age already sag to a tremendous level.
"Hey dude, look at that s.a.g over there her's are like hitting the floor lmao!"

"Dude did you see Kati last night? I didn't know she was a s.a.g!"

"Holy crap man did you see Freddie's mom when we went down the beach? S.a.g man, sooo s.a.g"
Related Words
simp school sex Sams swag Sus sarah slut Sophia shit
That Chick Was Fulli Sik Bro
S!K by Nero Bass July 26, 2005
Sex and mockery. Generally used to describe a relationship that is based on sex, in private, but in order to keep the appearance of friendship, they mock each other in public.
Derek: Do you want to go out to lunch?
Meredith: Why are you asking me out to lunch? I thought it was just S & M?
S & M by Lauren Clark December 1, 2007
S.T.U.N aka Scream Towards the Uprising of Non-Conformity, a great band who just released their first CD
S.T.U.N is so fucking great..
S.T.U.N by Anonymous August 14, 2003
Can stand for many things including:

Somebody Eats Choce (You are being a shittalker in Farsi)
Smelly Eggs and Cheese
Sephardic Educational Center
Sweet Easter Candy

also the name of a Crew centered in Beverly Hills and Santa Monica

Peace nigga

PEEEESSSS
S.E.C. is G'd up cuz
S.E.C. by Nasan December 21, 2006
Stands for 'Sl*t High On Ecstacy.'
Tanya- What do you think of that Maddison girl?

Kimberley- She is a S.H.O.E.
S.H.O.E by Captain Raison March 28, 2009