TMG
TMG definition by Slang.net - The Slang Dictionary
This page explains what the acronym "TMG" means. The definition, example, and related terms listed above have been manually compiled and written by the Slang.net team.
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When you want to brag about your daughter, sister, girlfriend, etc., you can send "TMG," which stands for "that's my girl." Most people send it when praising a person for their performance, whether it be getting 100% on a test, receiving an award, landing a hilarious burn, or standing up to a bully.
You will most likely see TMG in texts or online messages. However, you may also see it in posts on social sites, like Twitter or Facebook, about how proud a person is of someone.
For example, a dad may text a pic of his daughter in her graduation gown to another family captioned with "TMG! So proud of her!" Or, an Adele stan may tweet "TMG" alongside a pic of Adele rocking a dress on the red carpet.