A shower princess is someone who spends too much fucking time in the shower. As a result, some people don't get to wash their ass, and if they do, it's usually cold water leaving one with the feeling of surfing off the coast of Alaska, mid winter. And in worse case scenario, when water is limited, leaving other's with little to no water.
The shower princess is not to be trusted. The shower princess will make statements and promises regarding speed of their shower. Do not believe them; they are falsehoods. The shower princess should be dealt with promptly, firmly and with no remorse. They will smell your weakness in your sweat and deem you weak, flabby and feeble minded. Be steadfast in your actions.
The origin of shower princess is unknown but it commonly used by US military service members living in barracks, in the field, or deployed.
Soldier 1: "That shower princess Snuffy has been in there for over 45 minutes and my shift starts soon. And everybody is gunna be like, yeah, that guy, over there, he smells like dirty buttholes"
Soldier 2: "If it's cold you should shart in his pillow case tonight"
Soldier 1: "Duly noted"