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1.
A phrase used to end a sentence in which the speaker knows nothing of his or her topic.
I believe that our education like such as in South Africa,
and the Iraq, everywhere like such as.
by calimocho September 10, 2007
 
2.
Some people apparently think it's funny and original to coin a new noun and call someone "such a new noun". To those people: it's usually not funny, and it's certainly not original.
Taken from actual Urban Dictionary definitions:

"Kirsten is such a hypochristian."
"Stevie is such a slutbag!"
"He's such a nintendrone."
"He's such a wimpy nucker!"
"That prude is such a Mar!"
"hahahaha ur such a Davis"
"Oh B, you are such a narutard."
"Yeah, he's such a masnun."
"He's such a vidiot."
"Look at Jeff, he's such a lurp!"
"Allison is such a skanksta."
"Your girlfriend is such a mise!"
"God, stop being such a natch."
"Jkea, you are such a nerb."
"She is such a facehead!"
"Yazzy, you're such a snigger."
"You're such a foge!"
"She's such a skemo."

Another banal convention popular on UD: "pulling a (name)", where one inserts any name of their choice.
by eje July 29, 2007
 
3.
A compound word made up of the words such and a, meaning very. Usually used on MSN.
"She's sucha loser."
"That's sucha pretty shirt!"
by LIZ_ September 12, 2006
 
4.
all about the truth
person 1: did u just shit your pants?
person 2: yeah i did
person 1: damn your sucha
by mr bhatta May 06, 2004