a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
interj. in my (humble) opinion. (Initialism. Used in electronic mail and computer forum or news group messages. Not pronounced aloud. See also IYHO.) : She is the person to choose, IMO.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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IMHO definition
chat (From SF fandom via Usenet) In My Humble Opinion. Also seen in variant forms such as IMO, IMNSHO (In My Not-So-Humble Opinion) and IMAO (In My Arrogant Opinion). [Jargon File] (1998-09-24)