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1.
the term Oh my lady gaga is a popular chinese expression used instead of oh my God. the Cosmopolitan magazine is calling it the expression of the moment (end of 2010)
Oh my Lady Gaga! this is awesome! she deepthroated all

omlg that's hot!
by Axel F l'As Multimegatonique October 18, 2010
 
2.
An expression used in China to demonstrate suprise. Secretley created in a lab back in 2009. It's primary use is to destroy the English language.
Annie: Oh my lady gaga!
Hannah: what did you just say?
Annie: Oh my lady gaga! its like oh my god but cooler.
(Hannahs head then explodes)
by Lord_Hanson October 31, 2011