m.u or mu is an abbreviation that means "Mutual Understanding." It's when two people like each other but won't commit to a relationship.
me and julia aren't together, just m.u.
by kimkikay March 24, 2020
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M.U. Mutual Understanding. This meaning can be defined in two ways:

a. 2 people like each other but aren't in a relationship
b. A talking stage between two people who like each other
N: Hey, aren't they a M.U.?
by Rocksssssssssssssssss October 23, 2022
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1. hayy.. gusto ko tanggalin m.u ko..
2. cant take off my m.u

kris 3:56:45 AM
di ko nagawa mg bura ng m.u ko
by gagongdj December 6, 2010
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Abbreviated for the phrase, "Mobile Upload." Most commonly used on Facebook. Only those deeply affiliated with Mobile Uploads can use it. "Mupload" is the immature form of M.U.
That's such a cute m.u.! Let's upload it!
by musforeveR!!!! January 26, 2010
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