Definition of ICYMI
—used to draw attention to something published or posted online earlier In case you missed it, the initials ICYMI stand for the first five words of this sentence. In the event you have, indeed, missed it (ITEYH, I, MI has not taken off yet for some reason), it's most likely because you're not on the Internet much, particularly Twitter, where individuals and outlets deploy it every few seconds to bring links to the attention of others who may not have seen them. — Teddy Wayne, The New York Times, 4 Jan. 2015 On Facebook, his posts in a week will range from ICYMI stories (in case you missed it), to information on an upcoming town hall, to a personal photo of his daughter. — Elizabeth Flock, U.S. News & World Report, 7 Aug. 2012
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