What's a grimmin?

Tiffy: Is there such a thing as a 'grimmin'?

Me: A grommet?

Tiffy: No, a 'grimmin'.

Me: I have no idea what that is.

Tiffy: It's on the tape. He's talking about an 'escrow grimmin'.

Me: Could it be an escrow...agreement?

Tiffy: No, he's definitely saying, 'grimmin'.