The act of showering with 2 or more individuals to save tons of water. Started by AXE, in 2012, proposing that if everyone showerpooled for a year we could save 29 trillion gallons of water. Usually but is not limited to showering with like-minded acquaintance ...or an attractive stranger.. which could result in the next big Baby boom, or the biggest sexual transmitted disease outbreak in the history of history.
"Dude man, you should totally go showerpooling with those cheerleaders over there, you'll get wet together, and save water"
Dad: Our waterbill is outrageous, it's because our daughter showers 5 times a day!
Mom: I know, we need to find help for her. She's becoming a showerholic.
Someoneor something that interrupts and intrudes upon an otherwise relaxing shower, perhaps because of an urgent need to use the shower. Especially when only one bathing facility is available.