Noun: a sexual/sensual food party, in which participants cover each other in foods of different tastes, textures, and temperatures. eating the food off each other is optional. Nudity and sexual interactions often follow. Other common usages are the present verb splosh
and the present participle verb form sploshing
"We were at this sploshing party and my friend got covered in chocolate sauce and whipped cream, then they had her sit on a birthday cake! she really loved it!"