Shave in a lower way
It means shaving the little hair that is on the obvious parts of a girls' body.
This will work perfectly if you are in a situation when your girl has not shaved her arms or legs. You do not like that, but you do not want to offend her either. In such situation you say to her politely:
"Honey, you need to shave in a lower way."
"Honey, you need to shave in a lower way."