Oh girl, you make me such a nursernI used to be love drunk, but now I'm who knows whatrnI love you forever, forever is outsidernWe used to kiss all night, now it's just a c**k fightrnSo don't call me lady, say hello to goodbye

The story:

I had heard this song on the radio a couple times and was
wondering what was up with the "now I'm who knows what" part. I
was like "wow, these are stupid lyrics." and they still are... but they
make a little more sense now :P