What does Zinkoff's family call their car?

Mr. Zinkoff calls his "new" used cars "honeybugs". His family, however, calls them "clunkers".

Every time he buys one he gets excited. “She’s a real honeybug,” he says.

The day always comes when Mrs. Z whispers to her son, “It’s another clunker.” Zinkoff giggles and nods, but he never says the word “clunker” to his father, as that might hurt his feelings.