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1.
Meaning "Just Kidding... but seriously". Trademarked by Just Kidding Clothing out of Minnesota. Used anywhere in text..... jkbs
I was vibin your mom last night!...... jkbs
by Just Kidding Clothing April 03, 2011
 
2.
Just Kidding But Seriously. When you are just kidding about something, but you really mean it.
Hey loser, jkbs.

Wanna make me a sandwich? jkbs.
by beyonk-a-donk September 26, 2010
 
3.
jkb
An alcoholic beverage consisting of white rum, Diet Coke, and a lime wedge.
"I'll have a JKB. Duh."
by Alex Huxley June 20, 2008