It's a letter from my grandpappy saying he's coming for a visit.
5 seconds sound clip from The New Adventures of Winnie the Pooh - Cloud, Cloud Go Away / To Dream the Impossible Scheme (S4E7).
You can hear this line at 00:12:12.664 in the Blu-ray version of the episode.
Quote context
[...]
- What... Oh, my. My garden! Stop, I say! Cease! Go back! Wrong way!
- My putabaga-rotato! My ruta-potaga-batato! My... My... My goodness! No!
- Say! That's one doozy of a roadblock.
- Gopher, you very nearly destroyed my rutabaga-potato.
- Never mind that thingie. I got some spectacular news, sonny.
- It's a letter from my grandpappy saying he's coming for a visit.
- You have no idea how delicate, how terribly fragile this plant it.
- The poor thing is probably a nervous wreck.
- By dinghy, my grandpappy Gopher is the gopher to end all gophers.
[...]