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.
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