What is the meaning of Noddy?

A stupid or silly person.

Any of several stout-bodied, gregarious terns of the genera Anous and Procelsterna, found in tropical seas.

A small two-wheeled vehicle drawn by a single horse.

An inverted pendulum consisting of a short vertical flat spring which supports a rod having a bob at the top; used for detecting and measuring slight horizontal vibrations of a body to which it is attached.

An certain card game.

 Fellatio.

A cutaway scene of a television interviewer nodding, used to cover an editing gap in an interview.

Source: wiktionary.org