A whore alarm is the sound made when a gay dating app such as Grindr, Growlr or Scruff makes a distinctive alert sound. Since these apps are mostly used for hooking up, everyone in the room knows you are being a whore.
Paul: *ding ding* "Oh shit lemme get that!" *Checks phone*

Dave: "Oh shit! Paul's whore alarm is going off! He's gonna get some!"
by Nerdkub March 4, 2014
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