Top Definition
A masturbatory act where a male sits on the toilet and takes a shit while he masturbates.Thus, he is essentially "pumping" (masturbating) his dick while he excretes "sewage" (shit) out of his ass.
Dude, the other day, I was pumping the sewage so hard; I came all over the bathroom wall!
by sewagepumper August 20, 2010

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