Before you ream a chicks ass you should always test the oil, to make sure her chocolate star fish is clear. This is done by going at it doggy style and in the process wopping a digit up the ass and pulling out to see if it is clean and safe to proceed. If all is good have fun, if not grab her hair and use it to clean your finger as if cleaning a dip stick on a car.
"Dude last night went to fuck this chick ass but lucky I remenbered to test the oil first or I would have been a mess, she was full to the max level"
by littel Jon March 5, 2007
testing the oil is when a team of, say, soccer players goes to shower and if anybody gets a boner sometimes they try and just dip the tip as though an oil cap in your car. in the puccis of anybody who cant turn around. test their oil. you be a dipstick ya see
Ron is doing his thing where he overcomes his autism by trying to temporarily dominate any encircling opposition; he's testing the oil again
by 420osis April 7, 2018