the.com/splat

means A soft, wet impact sound — and by extension, the act of hitting a surface with a messy, flattening splatter.

from Pure onomatopoeia — splat exists because it sounds like what it describes. It emerged in English as an imitative coinage, likely nudged along by similar-feeling words like 'spat' and 'splash,' all of which cluster around that same wet, abrupt consonant punch. No deep root to dig up here — its etymology is basically its sound effect.