BFF Jill

In reference to Best friend forever, as in the commercial...
Mom: Who are you texting so much?
Girl: I DK, my BFF Jill

Anyone you hang around a lot, for work related reasons or otherwise, even if they aren't your best friend.

RIck: AnnMarie, where is your BFF Jill?
AnnMarie: I don't know. I feel lost without her, we've got to get this project done for Monday.

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