bat call

A last-minute, general email to a group of friends to get an impromptu outing together.

My mom got food poisoning and they can't use their cabin this weekend, so I'm sending out a bat call. Let me know if you're up for it.

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Bat call

Last minute call/text to/from someone for a get together or a meet up.

Oh shit I just got the bat call from Bobby, let’s head over.