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A sex act similar to the "Cleveland Steamer" involving one party defacating on the other. Unlike the Cleveland Steamer, however, one uses no saran wrap to create any kind of steam effect. Rather, one simply "dumps" on their partner.

The Dayton Dumper is named after another notable Ohio city, Dayton, on the other corner of the state
"I'm telling you, she was filthy. She asked for the Dayton Dumper straight up."
by LMNP December 26, 2005
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