When a girl is wearing large, men t-shirts that do not fit her, while going out in public or to a party.
Its Friday night and your at a party looking for that fine girl. Your friend comes up to you and points out the weird nasty girl. You ask who and he says the one (macked out).
We totally macked out that 'whatever', showing it taken over-the-top...like a kitchen loaded with top-of-the-line appliances, PLUS some other cool stuff.
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.