A very skilled man. A man knows too much. This expression is not related with the word puta. Because of the similarty with that word, is applies only for men and not for women.
1. He scored 10/10, he is "un putas"/Sacó 10/10, ese tipo es un putas.
2. He resolved that very complicated problem for us, definitely, he is "un putas" / El tipo nos resolvió el problema, definitivamente es un putas.
3. He fixes cars very quickly, he is "un putas" for car mechanics. / Arregla los carros muy rápido, es un putas para la mecánica.