Oh, I'm always dropping it.

2 seconds sound clip from the The Picture of Dorian Gray movie soundboard.

You can hear this line at 00:25:59.783 in the Blu-ray version of the movie.

Quote context

[...]

- Late as usual, Harry.

- Please forgive me, Aunt Agatha.

- Punctuality is the thief of time, Harry says.

- Victoria, darling, how nice.

- I love coming to your house, Aunt Agatha. It's one of the few places I'm likely to meet my husband.

- Oh, I'm always dropping it.

- Mr. Gray has something terribly important to tell you, Harry. We're all dying to learn what it is.

- I imagine it can wait until luncheon is over.

- I'm vexed with you, Harry. Why do you try to persuade Mr. Gray to give up the East End?

- He's a wonderful musician, and they love his playing.

[...]