Pigeonhole bit - Tradução em português

Alguém sabe me dizer o que significa "pigeonhole bit"? Não encontrei tradução em lugar nenhum. O contexto é o que segue:

PETER [almost pouting]: Oh, I thought you lived in the Village.
JERRY: What were you trying to do? Make sense out of things? Bring order? The old pigeonhole bit? Well, that's easy. I'll tell you. I live in a four-storey brownstone rooming-house on the upper West Side between Columbus Avenue and Central Park West. I live on the top floor; rear; west. It's a laughably small room, and one of my walls is made of beaverboard.

Aproveito para pedir sugestões de tradução para "beaverboard" (última palavra do contexto).