Abbreviation of "Join In". A spoken adaption of the culture of 'text language.' Used either as a noun to refer to someone who is an unwelcome member of the party but impossible to shake off, or as a verb describing the action of joining in with a group of people for lack of any better occupation.
Related to tag along.
Noun: "Who invited Katie? She's such a J. I."
Verb: "Hey my bus will be delayed by at least an hour so can I J. I. with you guys?"
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