Adjective and Noun. Used to define a situation or person of incredible and ridiculous stubbornness. It is worth noting that the usage of 'luntz' is not a trifling matter, as the extent of stubbornness that it entails is beyond any previous possible estimates. It is effective in describing circumstances where one finds him/herself literally speechless at the stubbornness of a person or unnecessary complexity of a situation.
Guy 1: No, i'm telling you, i'm right. there is no way that you like baths more than i do... And also, golf is not a sport.
Guy 2: You're behaving like a real luntz.
A Luntz is a maneuver where a man (preferably someone superior in the VRWC) shits in the mouth of another man, and the now-shat-upon man spews forth the fecal matter in a spray that covers the viewing audience. While the shit is still in the mouth of the now-shat-upon man, some of the feces likely soaks into his brain, as it does into the brains of the viewing audience.
-I was watching FNC and I totally saw Hannity perform the "N-S-U man" portion of a Luntz. Good thing I ducked.