Quick question: in Lady Gaga's song "Bad Romance," does it go "I want your psycho, your vertigo stick" or "I want your psycho, your vertigo shtick"?

I always heard it as the first way and saw it typed that way on a lyrics site as well, but I just read in another source that it's "shtick" instead. And now I'm confused. "Shtick" gives it a different interpretation than "stick." Which is the correct lyric?
The second source I cited was Wikipedia: While being interviewed on the November 2, 2009 episode of It's On with Alexa Chung, Gaga pointed out that she was listing Alfred Hitchcock films in the verse, "I want your psycho, your vertigo shtick/Want you in my rear window/Baby you're sick." She said, "What I'm really trying to say is I want the deepest, darkest, sickest parts of you that you are afraid to share with anyone because I love you that much."