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.

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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.

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check her oil

When engaged in foreplay or intercourse you insert a finger or fingers into your partners anus, thus "checking her oil".

"As I was doing my girl in the doggy position I reached down to check her oil."

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