"me mate dangerous dave took 22 ecstasy and drove the egham to langley village bus better than he's ever driven it before." -Ali G (a quote close to reality)
When a male is having sex with a female in the doggy style position, the male presses his thumb against the girls butt hole. His hand and fingers should be spread across and grabbing her booty kind of like you would grab a steering wheel in a vehicle. Inserting the thumb is known as honking her horn as she will most likely yell upon insertion.
The act of sticking your thumb in a girls anus while hitting itdoggie style and moving the thumb to make a motion similar to driving a motorized vehicle with a steering wheel.
An obscure sexual maneuver popularized in Russia, in which the vagina and anus are simultaneouslypenetrated, with a thumb and two fingers, respectively. The rectum is then pushed outwards into the cervix, where it is rotated by the two fingers.
"Darryl gave you the three-fingered bus driver?"
"Yeah. It was the most horrifyingexperience of my life. After that we went to Olive Garden."