Definition
When someone says they'll be BI5, it means they'll be "back in five." In online chat, people use this acronym when they have to goAFK, but expect to be back in five minutes (or less).
Origin
slang.net
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See “BI5” in Corporate Speak, Gen-Z Slang, Pirate Speak, and more.
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dwbh
don't worry, be happy...