Someone who initially appears intelligent but is found to act idiotic in the majority of situations.
A Niddy will - act without thinking
Ask the same question more than
twice
Not be able to see something directly in
front of them
Have a
terrible memory
Be extremely clumsy
Overuse telephones
Think that sarcasm is wit
Under no circumstances can a Niddy multitask nor even think and speak at the same time.
Can also be used as an alternative monika for males named 'Christian'.