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1.
an expression of something that is cool, synonyms would include dope, sick, awesome, good, Gucci
Lax Bro 1- Bro last night was sooo Dior

Lax Bro 2- ah man you know it Lax rip seshes and FIFA, so dior

Dude 1- What's Dior man?

Dude 2- Just finished playing FIFA about to hit up this sick ass foam party

Dude 1- Ohh Dior I'm hittin that up too
by M$HCHILDERMATTYV April 23, 2011
 
2.
A classy designer that sounds like a classy way of saying Dear!

So this is what you call a classy mate lol, as a substitute for the word Dear

Really good to use on your gay mates! They like the label!
"Hola Dior how are you doin chic?"
by Trinkbar_Trina March 29, 2005
 
3.
A designer line which is anything but classy. It used to be very classy back when it had very classy people running the designs. Then that overly flamboyant idiot John Galliano stepped in and started making ugly, flamboyant, an urban clothing. Not to mention perfume that smells like chemicals and ass. The simple yet sophisticated evening dresses of christian dior are now a thing of the past.
ghetto/trashy girls love christian dior more than gucci.
by mataaan December 25, 2006