Petrol Pump means: For when you are in dire need of shit, rhyming slang is for “dump”. (in Community Dictionary, added by Cruz Berry)

What else does Petrol Pump mean?

  • As a joke, men will poop in the mouths of their friends and mate’s. (in Community Dictionary, added by SmellyboofMesial)
  • You do this by putting your cock in the mouth of your partner and then shooting it down the throat like you are filling up the Petrol Pump. After you’ve cum, you must tap your cock on their bottom lip and shove her panties in her mouth as if you were putting the Petrol cap again. (in Community Dictionary, added by Uriel Hardy)