OMG! It's Lady Gaga! And she's totally telling lies to a (flying?) muffin.
Yes - that's right! She's bluffin' with her muffin!
According to the Internet, this phrase means all sorts of thing. They are mostly rude things. I don't really care about that. I just thought it was funny if that entire song was about telling lies to a muffin.
I need to go to bed / get a life / stop being a moron.