MOO
MOO definition by Slang.net
This page explains what the acronym "MOO" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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MOO is a quick way to preface that the following or preceding opinion is your own. It is similar to IMO but is less common, probably because it looks like the sound a cow makes.
There are many times in which you might use MOO, primarily online in messages, forums, and social media. For example, your friend may send you a pic of her in her new dress, and you might message her, "MOO, that new dress makes you look like a cow."
Since MOO is the same as the sound a cow utters (not udders), you might confuse the recipient if they are not slang-savvy. Therefore, use MOO with discretion.