What does BNI mean?
Batteries Not Included
Other definitions of BNI:
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How to use the term BNI:
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More slang terms:

LMMFAOS
laughing my mother f**king a** off silly

INTEL
intelligence

MY MAINS
In the case of Super Smash brothers (a video game where famous Nintendo charaters duke it out). Your mains are your charaters your used to playing as, Thou most people only have one main charater per Smash game.

LBH
let's be honest