He had a few nicknames. His preferred nickname, used by close friends, was "Wolf". "Adolf" actually derived from old German words meaning "noble wolf", and Hitler liked being associated with the animal.Some people called him "Adi". But my understanding is that he didn't really like it, so not many people called him that, especially after he took control of Germany.A funny story that has been circulating is that apparently he one time he got so angry at his generals that he screamed and yelled, and eventually fell on the floor. Once down there, he was so enraged that he actually started chewing on the carpet! So the military officers who witnessed this jokingly called him Teppichfresser behind his back- "Teppichfresser" translates roughly to "carpet muncher".