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An initialism for "pardon me for jumping in," used in online written communications to interject into an established conversation or thread of responses. PMJI—I just have to respond to dog_lover-2010's post, because they're basing it off of a lot of misinformation.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
interj. Pardon me for jumping in. (This indicates that someone is responding to a message directed to someone else. Used in electronic mail and computer forum or news group messages. Not pronounced aloud.) PMJI, but I have some information that would help you with your problem.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.