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1.
The tradition of a same-sex group gathering for the purpose of showering together. Usually the activity takes place with the most intimate of friends who are comfortable enough to bond in nude. The activity generally celebrates positive themes of group friendship, such as ethnic diversity or similar taste in music, and can last from fifteen minutes to an hour, depending on the slowest person to "finish". (originates from the state Washington, United States)
Hey Ricardo, don't miss the shower party tonight! We are welcoming a new friend and we're probably going to put on the Kill Bill 2 soundtrack.
by Greenray April 06, 2009
 
2.
The pre-lash party that occurs in the communal showers at the sports centre after a tough training session, involving booze, music, and showers.
Usually, it is used as an excuse to pre-drink for a big night out when training finishes late.
Girl 1: "What is all that music coming from the changing rooms?"
Girl 2: "Yeah, the basketball girls are having a shower party."

Girl 1: "Training ends pretty late tonight, I won't have time to pre-drink"
Girl 2: "Just come to the shower party!"
by psypb2 May 06, 2013