unbiffle
Someone who was your best friend but now is not. To reject te use of the Biffle status by calling them someone who is not your best friend anymore. An unfriend.
Sally: Hey, you're my biffle right?
Jane: No, ever since you dated my ex Billy, you're my unbiffle.
Billy: Hey ladies!
Jane: No, ever since you dated my ex Billy, you're my unbiffle.
Billy: Hey ladies!