Oh dear, if something makes your flesh creep it means you feel frightened or disgusted by something. I don't know why I do it. It just feels nice.

哦天啊，如果某事物让你毛骨悚然，那意味着该事物让你感到害怕或者厌恶。我也不知道我为什么要掰手指。我只是感觉舒服。