BFFM
Best friends forevermore
Example
You and I are BFFM!
BFFM definition by Slang.net - The Slang Dictionary
This page explains what the acronym "BFFM" means. The definition, example, and related terms listed above have been manually compiled and written by the Slang.net team.
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BFFM (best friends forevermore) is a variation of the popular BFF acronym. It is used to refer to your best friend, pal, or mate, and it communicates that your friendship will never end.
There's pretty much no difference between BFF and BFFM, except that "forevermore" sounds more fanciful than plain ol' "forever." So if you want to make your friendship seem more magical, you can use BFFM anytime you'd use BFF (though the first time you use BFFM, you'll likely confuse your best friend).