look up any word, like wcw:
 
2.
just kidding, but not really. used to suggest that the joke you just told was actually serious.
Jessica(who has naturally black hair): I heard that Ben has a thing for blond chicks, so I'm dying my hair blond. Jkbnr.
by littleinu May 14, 2010
 
1.
Just Kidding, But Not Really.
"I'm going to get so drunk tonight I might just hook up with your mom. JKBNR."
by Johnny Haze August 03, 2009