MU
In real, traceable use. Part of the curated seed collection; community review is coming.
Sense 1
Meaning · English
Initialism of mutual understanding
Register: slang
Where it’s used:
Used
American English
Sources & notes
Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30 via kaikki.org).
Sense 2
Meaning · English
A person engaged in a situationship
Register: slang
Sources & notes
Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30 via kaikki.org).
Common questions
What does “MU” mean?
Initialism of mutual understanding
Is “MU” formal or informal?
MU is generally slang.