The sexual
act of grasping an erect penis and moving it about in a
way that you would a car's gearstick, while at the same time, imitating the
sound of the gears changing.
Mark was happily receiving a hearty
blowjob from the
girl from Perth but was caught off guard when she abruptly stopped and began to gearstick him. He noticed that she was particularly adept at imitating the
sound of the gears shifting. Perhaps, he thought, she had a passion for car racing.