The ability to distinguish the gender of other individuals, especially when the individual is trans in some way. Similar to gaydar, but this applies to gender performance, not sexuality.
Jimmy's got such bad gendar, he thought that that woman was a man.
by Poupard November 05, 2007
Gendar is the gaydar of gender
"man that dudes a chick!" good use of your GENDAR friend!
example.2 I can't tell if that is a boy or a girl, duh da da da I can tell you using my gendar right now its definitely a boy
by seudophederal April 25, 2011

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