When a man fucks a woman/man's mouth while simultaneously shitting on the chest of the fellatio performing participant.
Jimmy's girlfriend was giving him head while Jimmy had a serious case of the runs (too much cheap beer). At one point Jim could not hold it in and in the middle of the mouth-fucking, let his bowels loose all down his girlfriend's chest; giving his partner her first ever Las Vegas Oil Change.
by Pubes Monroe May 23, 2012
Changing the oil of your car in the parking lot of a auto store so you can buy and dump the oil off without having to drive to and from the store.
by Steepleton May 28, 2022
Putting a funnel into someone's butthole and then diarrhea into the funnel, filling their ass with your diarrhea.
by DJBeefer October 21, 2013
The sexual act of placing a finger in your female sexual partners anal canal and vaginal canal simultaneosly to check her viscosity of either entrance. Then as the mechanic on duty you determine if she is a quart low and you give it her anally or vaginally after you attain the proper lubrication on your dipstick.
by Dave Winkelman November 9, 2007
My boss asked me why I was fifteen minutes late for work; and I told him I was helping a friend get an oil change. Thankfully, he believed me.
by El ritardo April 17, 2020
When you stick two fingers up another persons anus, but you do it every couple of minuets. Since a regular mexican-oil change keeps adding oil, you keep adding your finger.
She was getting clogged up back there, so I gave her the 2 fingered mexican oil change, and now she "runs" clean.
by Kevin Benson December 4, 2007
A man sticks two fingers in a womans butthole and puts it in his butthole then sticks his fingers in her vagina by finishing with both fingers then in his mouth
by Ben and Stephens wacky words April 19, 2017