Heebe gebees are symptomatic of RLS or Restless Legs Syndrome where any part of the legs may be affected by the sensation of ants crawling up and down under the skin and making it impossible to sit or lie still. With heebe geebees you can't remain still, so intense is the irritation. About 9% of the population has heebe geebees and there is no cure for this affliction at present. Although you may get an attack of heebee geebees during the daytime the affliction generally asserts itself at night when you go to bed.
It is said of the situation where a person has the bad luck to make contact with his testicles against an undefined surface or object, intentioned or not.
Given the nature of the word, it is more appropriate to design cases where the interaction is made with a moving object, for example, a ball.
Although it is extremely painful for the victim, it tends to be considerably funny to people who witness it.
Today in the baseball game the pitcher took a nutshot; the baseball hit him in the nuts.
Man, I just watched the funniest nutshot video ever.