IMU
IMU definition by Slang.net - The Slang Dictionary
This page explains what the acronym "IMU" means. The definition, example, and related terms listed above have been manually compiled and written by the Slang.net team.
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Someone who is feeling lonely and thinking of you may use IMU to mean "I miss you." This acronym expresses a person's longing to see you again IRL.
"I miss you" may also be abbreviated as IMY, and a person you just saw may use IMYA to mean "I miss you already." If you also miss the person who sent you IMU (or any of its variants), you can respond with IMU2, which means "I miss you, too."