Top Definition
The act of being in the 69 position and "checking the girl's oil" (insertion of finger into doodie hole). Then sniffing finger for purity. Checking anal viscosity.
The Bianchi Dipstick: That girl Jen looks pretty hot. I'm gonna give her a Bianchi Dipstick and check her 10w30.
by Pencil-Dick Jones April 10, 2011
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