A radar built into every male that reacts to hot female presence.
Mandar's can be detected by other males in a fashion similar to sonar, where the men give off the vibe of a hot female in the area, causing others to all bring there attention to the female.
A Failed Mandar:
"Dude! Did you see that hot piece of booty walk by?!"
"No bro, my Mandar didn't go off!"
The other day I was driving and almost crashed when my Mandar went off.