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When you cum on a girl's stomach and she pushes the cum down in her vagina and uses it as lube much to your surprise, disgust, and slight sexual curiosity.
Amy is such a freak she tried to give herself a Matt Splat much to my amazement and secret arousal.
by matt311311 May 06, 2009
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A some what portly old bastard. Often found smoking cigarettes and telling dirty jokes at the shop. He sells ice cream out a panel van.
Matt splat is a dirty old man.
by Eatoutalexesass May 04, 2018
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