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2.
A family reunion involving a pool, a barbecue, sports and genuine fun in the sun!
Cool Bro: Dude are you going to Amy's party?
Cousin: No way dude, I get to go to a Splash Bash!
Cool Bro: You're so lucky, I wish my family loved each other enough to throw a splash bash... but they don't.
Cousin: Oooh... awkward.
by mailmansam7 November 25, 2011
 
1.
A fraternity party that occurs for several hours, then at midnight, all party-goers throw about water bottles filled with paint.
I just went to splash bash at AEPi and my clothes got so messed up with paint it was the best night of my life.
by john evanson September 05, 2006