A heightened state of mind achieved just after the male orgasm. Effects include: Being able to finally understand your maths homework, logically deducing your life choices as well as understanding nietzsche.
Jack: "Yo Barney, how did Karl do so well in maths?"
Barney: "I heard he shagged Stacy before the test, it's probably Post Nut Clairvoyance."
The ability to perceive events occurring over a timelike, as opposed to a spacelike, interval. Manifests as a perception or comprehension of past or future events in the mind of the individual employing it. See psionics.