(slang) The ability to detect whether or not a person is bisexual by observing that person.
Though I _think_ he's straight: but then my bidar isn't always running at 100%.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.