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1.
Synonym for douche (onomatopoeia).
(Douche walks by)

Person 1: What a big splash.
by rj118 April 29, 2008
 
2.
A big (and chances are... ugly) fat guy who would probably cause a huge wake if he jumped into the pool. Started in oakville ontario.
girl: "eww that guy is such a big splash"
by SMLS girls December 14, 2005