A fork of Rural Dictionary
when you have done/almost something sexual with someone, and the whole school is hounding you for it as if there was a red target dot on you at all times.
*exception: slut-dar can be used even if it was a brief kiss, these are extreme conditions and have been known to occur at harbord numerous times
V: "randoms were talking about you and that boy in bio class"
M: "how the fuck did they know about it, they're so random"
J: "trust me, its the slut-dar, when one knows, they all know..."