Top definition
The area of sunburn from the bottom of your shorts to the top of your knees.

Usually suffered by those who are often on the water, use sunscreen but forget to take care of their legs.
"I used sunscreen but forgot my legs. Check out my boat knees."
by andrew silcock January 23, 2007
Get the mug
Get a Boat Knees mug for your mate Georges.
buy the domain for your diy blog