The tendency, especially among males, to make educated (?) guesses about subjects and present them as fact.

The syndrome manifests itself most frequently when the sufferer is asked a question by a member of the opposite sex.

Female: Do I need to put premium gas in my car?

Male: Absolutely. If you don’t, you will short out your cam injector bearings.

Female: Uh, I think you are suffering from Male Answer Syndrome.

Source: The above courtesy of the Urban Dictionary and what’s more you can buy stuff there too!