Answer: heresjohnny

AnswerCrossword Clue
HERESJOHNNYOnetime "Tonight Show" catchphrase
HERESJOHNNYIntroduction heard often on TV
HERESJOHNNYOld "Tonight Show" intro
HERESJOHNNYMemorable movie line spoken by ... Jack Nicholson
HERESJOHNNYEd McMahon intro words
HERESJOHNNYOld 'Tonight Show' intro
HERESJOHNNYLate night catchphrase, once