This is the act of shoving your cock as far into the mouth of your partner as you can and shooting your wad straight down her throat, like your filling the car up at the Petrol Pump. You must also tap your cock against their bottom lip after you have cum and then shove her panties into her mouth like you are putting the Petrol cap back on.
You: I Petrol Pumped Becky last night and almost made her choke.

Friend: You are ruthless.
by Paul Kippers April 20, 2011
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Rhyming slang for "dump" for when you need a shit
Guy 1 "Mate, I need a petrol"

Guy 2 "you what?"

Guy 3 "petrol pump, dump. . u pillok"
by Dave118 April 4, 2011
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Men pissing in other people's mouth, most notably their mates' mouths - used as a prank.
Bob: I needed a piss so bad, and Nick was just there, so i petrol pumped him.

Nick: It wasn't that bad. It tasted like brine.
by Antastic November 26, 2007
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The act of gripping someone’s sideburns (usually by the thumb and index finger) then yanking it “really hard”.
“I got hold of his sideburns and we played petrol pumps and I pumped it real hard and then he started crying!”
by Solvalou October 26, 2022
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