Checking the oil

You delinquently lift up the clitoral hood then proceed to aggressively lick the pussy until she squirts.

I was checking the oil on your mom last night.

Checking the Oil

In football when while in the dog pile you grab and twist and/or rip, someone's dick on the opposite team.

I don't know why they're so mad coach all I did was check their oil ( i.e. checking the oil).