Top Definition
When a male masturbates while sitting down on a toilet having a dump. It relates to the idea that he's pumping oil (poo) out of his behind with his penis.
"Hey Gary, let's sneak in the toilet and take a picture of Eric having a dump!"
"Yeh!"..
.."Oh shit man he's oil-pumping!"
by Adil Dough January 22, 2009

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