2 possible answers.
1. SnooPING AS usual, I see.
2. I hate that Hedgehog!!!
Chat with our AI personalities
This is debatable, if you were referring to the 10th doctor, his catch phrase was 'Allons-Y! While the current doctors most popular catch phrase is either 'Bow ties are cool', 'Rule no1, the doctor lies' or possibly the most popular 'Trust me,im the doctor/Hello, I'm the doctor/ I am the doctor'
She says Jeepers
Aaay!
Da-ee
On Quite Interesting Series 6 Episode 8, "Fashion," it was the catch phrase of guest Clive Anderson. According to host Stephen Fry, "Who are you?" was "one of the biggest catch phrases of the 19th century ... it was used in all circumstances, apparently."