When two switches (top and Bottom) can tell when another person is a switch just by talking to them or looking at them.
Person 1:"Aye look at Johnny they are a switch"
Person 2: " definitely,I could tell just by lookin at them"
Person 3:"Really? How could you guys tell?"
Person 1&2: "We have Switchuition"
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi