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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the act of getting screwed in the ass.
"Dude, I got my oil changed last night."
by StalkerMunkie October 23, 2007

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when a girl has her period it is an oil change. out with the old bad old, in the with good clean oil.
Man, she's on her oil change again.
by iwillbohnyou February 08, 2005

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the process of inserting fecal matter into a vaginal opening then subsequently delevering a stricking blow to the uteran area whereby said fecal matter is focefully and quickly exspelled through the vaginal opening
Charlie hated Clarissa so much he gave her a nasty oil change.
by Kurt January 24, 2005

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To stick your dick in bitch's asshole, and try as hard as you can to pee in her dirty slut ass.
That bitch Gabriel just got an oil change.
by Chaimo March 15, 2008

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where you unexpectily stick your index and middle finger up the lineing of someones anus.
john: "oil change!"
matt: "oooh was that the valvoline or the mobil? flush my transmission while ur at it."
by mr. 300 July 25, 2006

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an oil change is a euphemism for a blowjob, which in turn in a euphemism for oral sex, which in turn does not count as cheating (C:
Friendly Girl: Hey there soldier, you look like you could use an oil change
Sgt. Blue Balls: How did you know?
Prvt. Les: Careful she don't just bite it off.
by lowercased March 07, 2006

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