Meaning somebody who is j-u-s-t THIS side of heterosexuality, a borderline bisexual. Based on the 100% scale. (51% / 49%)
"Hey dude, you reckon that Robbie Williams & Sigourney Weaver are fiveonefourniners??"....
"Pretty sure on SIGOURNEY dude, as for ROBBIE.....he's debateable"