SU 

Another way to say "Straight Up".

"TLPC is an awesome band"

"Yo SU"

SU by TLPC March 7, 2014

su 

In the manga "Pita-ten", Misha likes to scream this randomly. It isn't a real japanese word-but it's still fun to scream randomly.

hey look, a pie su!
whats up su!
OMGWTF, the world is exploding! Suuu!!

su by Misha February 18, 2005

SU 

Someone or something boring (usually used in French slang)

David liberato est trop su

SU by Faranakmtl April 28, 2019

su 

Kaolla Su. Love Hina girl. Foreign exchange student, with a gift for gadgets. Shows no sign of ever wanting to mature, but secretly yearns to be an adult physically. Fond of Keitaro, as he reminds her of her big brother. Has a hidden past, revealed in later episodes of the manga...

I like you Keitaro. You remind me of Big Brother, but you're more funny!

su by Purokku-kun June 24, 2004

su 

a nest.. or vinegar

"su..."
"su? *places nest on head*"
"*shake head*...su"
"* give giant bottle of vinegar*su..?"
"*nod.. and chug entire amount*"

su by Scott " the yellow dart " Hoey December 2, 2003

su 

A german/french swear word directed specifically at people. Placed either in front or behind name of person.
example: austin su!
similiar in meaning to bodoh and f

stumme Scheiße jolere su.
lare su la merde sourde-muette disparaissent et meurent

su by restim September 15, 2005

Su 

A child-like person who performs many immature acts. This person is also the epitome of lame.

You are such a lame person, like "Su"

Su by Joer January 28, 2007