mongdar
'Mongdar" is a portmanteau of 'Monger' & 'Radar' in same vein as Gaydar etc.
It means a heightened sense of when pay to play comes into the sexual arena.
I was hanging in the bar at this Casio in Vegas when this hottie started making eye contact across the room. I was getting excited until I spied a 12 pack of Trojans in her purse and my mongdar went off like a tranny on the Jerry Springer show.