The ability that men possess that allows them to sense what is about to happen with their phallus. This ability is especially pronounced when there is an imminent threat to the groin area, and when there are possible sexual opportunities nearby. Also very useful for sensing nearby wallsharks.
"Oh man, guarded my nuts just in time; would have been a disaster if my precocknition didn't work!"
by Tyler "daylight lantern" Johnson April 24, 2008