snuffalupagus

1) The large wooly mammoth featured on the children's television program, Sesame Street. He could only be seen by Big Bird
2) A person or thing that either exists only in one's mind or others have never met, therefore think only exists in one's mind.

1) Big Bird and Snuffalupagus are best friends.

2) I haven't seen you in so long - everyone was beginning to think you were my Snuffalupagus!

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