A Box Month is a month in which the first day of the month begins on a Sunday and the calendar of the month forms a perfect rectangle. The only month in which this can occur is February, since it has 28 days. The occurrence of this event is quite rare. Since a Box month cannot occur on a leap (due to the 29 days), the pattern of re-occurrence follows a 6-11-11...6-11-11 year interval. For example the years in which a Box Month occur are 1981-1987-1998-2009-2015-2026, following the 6 yr, 11 yr, 11 yr pattern.
This rare event is celebrated throughout the month in commemoration of this rarity within the Calendar.
Dude 1: Dude, did you know that it's Box month this month?
Dude 2: Oh really, then let's fuckin party it up, cuz it's BOX MONTH!
Pickup line to Random Girl at Bar: Hey did you know it's Box Month?
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.