What does it mean when a girl has hairy arms? Hairy arms on a girl means she produces more testosterone and has a higher sex drive due to increased testosterone. How do you get rid of dark arm hair? If your arm hair is thick, you may want to use an at-home depilatory lotion that painlessly dissolves hair and leaves arms smooth for a week or so. As soon as you see regrowth, you can use the depilatory again. Try Nair Lotion Hair Remover With Baby Oil, $5.29. How do 11 year olds get rid of armpit hair? Simple Ways...