Top definition
It is the new "cool"
First used in Madison,Wi in January of 2008 by Dustin Taylor.
Synonyms: cool, sick, bad, wicked, sweet, ill, hip,awesome good.

Also used used to denote agreement or approval.
That car is totally YJ5. He is lookin' YJ5.

In conversation:
Q: You want to go out tonight to the show?
A: YJ5

by dustinternationally January 04, 2008
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