JJ
JJ definition by Slang.net - The Slang Dictionary
This page explains what the acronym "JJ" means. The definition, example, and related terms listed above have been manually compiled and written by the Slang.net team.
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JJ stands for "just joking." If someone you're chatting with sends you JJ, it means their last statement was a joke.
These days, most people use the acronym JK (which stands for "just kidding") in place of JJ. JJ was more popular during online chat's infancy, back when dial-up Internet and AOL Instant Messenger were big deals.