A synonym of the slang word "gaydar". This term is an offshoot of the US military term "Blue Force Tracker". BFT is a tool the US military uses to track Soldiers on the battlefield in real time. In this case the term refers to a persons ability to spot someone who is gay.
That one registered a blip on my Blue Fag Tracker (BFT)!
by lrsu December 05, 2010