If you do drugs and need to pass ampiss test, a P-vac isn't an option and you need clean urine, you'll need to do an oil change. An oil change is when you stick a sterile tube in your urethra until urine naturally comes out. Next take a syringe full of clean urine and inject it into the tube. There, your oil is changed.
The test is tomorrow, we'll never pass unless we do oil changes.
by xXxX June 11, 2013
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When you are sitting on the toilet, and the act of your poop dropping into toilet water, followed by the toilet water splashing up onto your anus.
Hey, Tom, how was your bowel movement?" "It was good, had an oil change which made the cleanup easier."
by PrescriptionK January 31, 2011
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The act of inserting a funnel into someone's asshole and then spewing your own diarrhea into said funnel.
My girl wanted a Cleveland Steamer last night. I wasn't feeling well so my poop wasn't solid. We opted for an Oil Change instead.
by TR653 August 28, 2008
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"Hey did you did you hear what Grant and DJ did last night? They were docking and Grant peed in the middle of it!"

"Oh you mean an oil change?"
by janeyikes August 10, 2018
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It's where you suck a dick til orgasm, keep it in your mouth, then blow it in the asshole, then feltch it back out and swallow. I don't advise it.
Damn I need an Oil Change.
by joosht March 19, 2009
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The act of a man inserting his penis into a woman's anal cavity and pulling it out with poop on the head of his penis, then inserting it into another woman's anal cavity, thus causing some sort of exchange of bodily fluids
Man, he gave me a real good oil change!!
by creamcheeseee January 29, 2016
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