ICYMIIn Case You Missed It
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Shorthand such as "Bae" (babe) and abbreviations LMK (let me know) and ICYMI (in case you missed it) were also in the top 10 of mystifying terms.
YOLO, the abbreviation for 'you only live once'); and ICYMI, intials for 'in case you missed it'.
And ICYMI, Jim Morrison named his band after the book, which took its title from a passage in William Blake's "The Marriage of Heaven and Hell":