BU&I
BU&I definition by Slang.net
This page explains what the acronym "BU&I" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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When someone says a piece of information is BU&I (between you and I), they want you to keep that info to yourself. So don't go blabbing.
Most often, people use BU&I when sharing gossip, secrets, or their personal feelings on a topic. While the person is comfortable with you knowing this sensitive information, they don't want anyone else to know.