v. when, in a college dormitory bathroom or other communal restroom facility, all of the shower stalls are occupied, and an individual who is short on time (or manners) strips off his clothes and runs into a random stall, gleefully yelling, "showerjack!" and forcing the former occupant out.
n. an instance of the above maneuver.
1) "Showerjack!!"
"Dude!? What the %^&* is wrong with you?"
2) "That was a nasty showerjack; I'm going to go soak his underwear in capsaicin."
To steal shower first even though another roommate or family member is getting ready for a shower, leaving them to wait impatiently for you in their bathrobe or towel.
Just as Tina prepared to enter the bathroom, she could hear that her roommate had showerjacked, and was stuck waiting for another hour.
A person of substandard intelligence (usually an emmit) who enters a particular chain of stores with the aim of annoying staff by upping footfall counts unnecessarily; This is usually followed by a complaint about something they wouldn't have bought even if they could afford it.
Less commonly used to describe people entering a store just to hide from what ever kind of weather happened to be prevailing at that time.
E.g. Walking into a shop that you have no interest in being in, then back out to fetch the wife, then back in again to show her a garment that you don't like so that you can have a good whine about it and/or its price.
Usually followed by a member of staff saying "bloody showerporker, that's ruined our conversion rate"
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.