A Rachel BRB (be right back) is when one person says BRB on instant messager with the intention of signing off and returning at a much later time. It should be substituted with a BBL (be back later).
Rachel: Signing off 5:30pm.
Rachel: Signing on 10:00pm.
Rachel: I'm back
Bob: Away Message Response: Went to bed.
Hence, A Rachel BRB, and not a typical BRB.
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