Secret phrase george yells when jerry is changing answering maching tape?

That's a great question! You're probably thinking of the classic episode of Seinfeld where Jerry changes his answering machine tape. But there isn't a specific secret phrase that George yells.

He does, however, barge in on Jerry while he's in the midst of recording a very personal message. It's a hilarious scene with George interrupting Jerry several times, making him re-record his message.

If you're curious, you can find the full episode titled "The Puffy Shirt" on streaming services or on DVD. It's a classic episode, and you might even find that the lack of a secret phrase makes the scene even funnier.