Checking oil 

A move a soccor player makes to injury or cramp a opponent. A forced plunging of the thumb or index finger into the anus

Did you see horhe check martinis oil at the game last night?

Yeah was a two dipper!

Checking oil cramped him right up.

Checking oil by Kerbangocwm December 4, 2017

Checking her oil 

A test to be preformed on a chick before eating her out. Finger her a bit and catch a whiff of your finger and you'll know if its safe to proceed.

Use your finger like a dipstick to check her oil

Yo man i checked her oil and knew it was safe

or

Yo man i checked her oil and DAMN!!! Was that a stank pussy.

Checking her oil by Herb311 October 25, 2004

checking the oil 

When someone tickles you too close to the butthole.

Oh man, you were really checking the oil there! i thought you were going to stick your finger in my butthole!

checking the oil by Ashley Mark April 29, 2008

checking your oil 

When one inserts their finger in their own anus in order to gauge their personal stink level.

Don't touch me bro, you been checking your oil

checking your oil by Informersno July 26, 2016

checking the oil 

When someone tickles you too close to the butthole.

Oh man, you were really checking the oil there! i thought you were going to stick your finger in my butthole!

checking the oil by Ashley Mark April 29, 2008

Checking her oil 

The act of fingering a newly met girl while in public.

Dude, he bought her a drink and within an hour he was checking her oil on the dance floor.

Checking her oil by dickintosh April 26, 2012

Checking the oil 

When you have so much grease and mold saturating the pubic hairs in the region between your gooch and your innermost cheek, that you can barely walk another step, and therefore "check," the oil. Depending on the circumstances one might: change your yellowing, mud-stained briefs, or dispose of them in the nearest body of water.

Goddamn! It's so hot out here that there is anal waste and sweat running down the bottom side of my thigh out of my shorts! This definitely requires checking the oil

Checking the oil by Dr. Dong Tip October 29, 2015