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1.
The words uttered by UK Skins generation two character Katie Fitch (played by Megan Prescott) when asked the question:

Who the fuck do you think you are?

Usually post punching the asker of that question in the face.

Can also be used when querying who you are.
WAG: "Who the fuck do you think you are?"
Katie: "I'm Katie fucking Fitch who the fuck are you?"

Katie: "I don't know who I am anymore"
Effy: "I thought you were Katie fucking Fitch"
by networksarah December 12, 2010