The action when you do not have any tissues left and you hands free forcefully blow the built up snot out of your nose and on to the ground.
"Dude do you have any more tissues?"
"Bro, just splonch on the ground over there"
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A splonch is defined as an action when one throws any sort of soggy item, be it a sandwich or a sock, at someone as a means of attack.
''Yeah, I met Cody outside yesterday, splonched him. It was the funniest shit ever.''