This is an antisemetic dog whistle used by nazis and the alt-right. It is an obfuscation of "6MWE", that is, "6 million wasn't enough", referring to the number of Jews killed during the holocaust. Google it in quotes, and you'll only find this page.
Nazi 1: 6 Men Weapons and Equipment.
Nazi 2: I totally agree, 6MWE.
by just-google-it February 1, 2021
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