The act of dumping your semen into someone's while playing the trumpet
Me and Sue did the Trumpy Dumpy in the school talent show
by SpacePieTato August 28, 2022
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When someone has a fat ass.
Crazy hobo: "You see Ryan over there? He has a dumpy-trumpy".

Normal Human being: "What the fuck".
by MrTophat2875 October 8, 2021
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