Definitions by MEMAW

JK 

A abreveation of "just kidding". Origanated from AOL instant messenger (AIM). Also stated as JK'ing.

person 1:I heard Canada was anexed into the U.S.
person 2:That is the most retarted thing i have ever heard
person 1:Oh, i was JK.
OR
person 1:Oh, i was JK'ing

JK by MEMAW April 19, 2006