BI5
BI5 definition by Slang.net - The Slang Dictionary
This page explains what the acronym "BI5" means. The definition, example, and related terms listed above have been manually compiled and written by the Slang.net team.
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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 go AFK, but expect to be back in five minutes (or less).
In texts, people sometimes use BI5 to state they'll physically return in five minutes. For example, if your SO just left a party and is on their way home, they may text you "leaving now, BI5."