Well, "ta-tas" is a common slang term for breasts. There is even a "save the ta-tas site". "Boobs" is also a common slang term for breasts. "Boob" is a common slang term for a total idiot, like you. Now, "tata" would be singular for "ta-tas" and "boob" singular for "boobs". So, I asked if you used the nick name "tata" because you are a boob.
(Can't believe I had to explain that one...)
Why the normalphobia?