If someone calls you a nimrod, they're either referring to your superior hunting skills or they're insulting your intelligence. Only a real nimrod wouldn't be able to tell the difference!
In the Old Testament, Nimrod was a descendant of Noah and was described as "a mighty hunter." Calling an excellent hunter a nimrod comes directly from this Biblical source — and so does the word's "inept person" definition. In addition to his legendary skill with a bow and arrow, the Bible’s Nimrod is also associated with the disastrous attempt to build the Tower of Babel, a fiasco essentially caused by a bunch of nimrods.