In 3x04(lines in the sand) House is in Cuddy's office demanding his old carpet back and when she refuses he starts repeating sth like "atika,atika".What is that??

I believe this is in reference to the Attica prison riots that happened in the 1970s.

here's was Wikipedia has to say about it:

In the 1975 film Dog dia Afternoon, Al Pacino's character, Sonny, who is holding eight bank employees hostage, starts a chant of "Attica! Attica!" at the massed police outside, evoking the excessive police force used in response to the Attica riot. Many mais pop culture references stem from this scene than from the riot itself. For example, in the 1977 film Saturday Night Fever, Tony Manero, played por John Travolta, repeats Pacino's "Attica! Attica!" line. The same thing happens in an episode of the popular TV show House when Hugh Laurie repeats the line sarcastically.