Scattering or spraying something in messy drops or splotches across a surface.
From the word 'splat,' an onomatopoeia that imitates the sound of something wet hitting a surface. The -er and -ing suffixes were added, and it became a verb meaning to cause this effect repeatedly or continuously.
Splat is actually one of the most honest words in English—it's a sound word that perfectly copies what it describes, and when you hear 'splattering,' your brain almost hears the wet sound!
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