When a girl calls a guy a "best friend" and is thereby elevated from the friend zone to the best friend zone.
Worse than the Friend Zone, yet not as bad as the Brother Zone.

Guy 1: I've been elevated from the Friend Zone to the Best Friend Zone.

Guy 2: You're Fucked.
by imaybeinsane May 2, 2010
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When your best friends ex is tryna fuck, but you don't feel like being compared to them in bed, possibly ending the friendship
"Hey your ex Joe tried to smash yesterday, I best friend zoned his ass."

"Good, he's got bad dick anyway."
by Anarchist 27 February 17, 2019
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