First of all, Dude, you don't have an ex.
4 seconds sound clip from the The Big Lebowski movie soundboard.
You can hear this line at 00:17:17 in the Blu-ray version of the movie.
Quote context
[...]
- I can't leave him home alone or he eats the furniture.
- I'm watching it while Cynthia and Marty Ackerman are in Hawaii.
- You brought a fucking Pomeranian bowling?
- First of all, Dude, you don't have an ex.
- Fucking dog has fucking papers.
- I'm sorry, Smokey. You were over the line. That's a foul.
- Bullshit. Mark it eight, Dude.
[...]