KMB
KMB definition by Slang.net - The Slang Dictionary
This page explains what the acronym "KMB" means. The definition, example, and related terms listed above have been manually compiled and written by the Slang.net team.
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Those who don't like to swear may use KMB to mean "kiss my butt." This acronym is a milder version of the more common (and more crass) KMA. Typically, it's used to tell someone that they're being a douche.
Gamers may use KMB in gaming chat, to taunt their opponents and/or tell them to BTFO. Outside of gaming chat, you may encounter KMB in (rude) text or chat messages, sent by someone who wants you to know that they don't care for whatever you just said.