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1. 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.
by Herb311 Oct 25, 2004 add a video
2. 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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