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1.
Abbreviation of J-C'ing (Just Chillin). The act of hanging out or chillin.
Sarah: What are you up to this weekend?
Mary: Not much, just jayin.
by fuyerto August 27, 2009
 
2.
To jerk off
Tom- What are you doing jake?

Jake- Just jayin
by yoitsjonbitch January 27, 2009