The act in which a hornybitch takes advantage of a mechanic lying on a wheeled platform (known as a creeper) under her car. This style of coitus usually involves the female sitting froggystyle upon his throbbing member.
mechanic: "Dude, you'll never guess what happened last night!"
friend: "What happened, Skipper?"
mechanic: "I totally boinked this girl creeperstyle while changing her oil!"