When two (Heterosexual) men have each simultaneously eat a separate piece of food. It must be done at a place of work during a break. Only men may do this.
A term often mistaken for male genitalia. The correct definition of the word is a modern day 'man bag', or the use of a male friend to carry female essentials on a night out/date/general laziness to carry a handbag. Such items include make up and a purse.
Example 1:
Girl: "You're my man bag for tonight";
Guy: "Correction. I am actually your man sack";
Rest of group proceeds to laughter.
Example 2:
Girl 1: "Who is he?";
Girl 2: "I'm not sure, he'd make a good man sack though".
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.