Virgil says his father "had a two-foot-wide smile on his face."
Like Sam, Virgil likes to use figures of speech―the language of comparison―to make his ideas clearer and more interesting. When a rat fleeing the vacant lot runs up the leg of a drug dealer, Virgil says that the guy "shook his leg like his toe was being electrocuted." That's much easier to imagine than if Virgil simply said the dealer was shaking his leg "really hard." (It's also more entertaining.)
There's something a little different about the way Virgil uses figures of speech, compared to the way Sam does. While Sam is very careful to explain his comparisons exactly, Virgil tends to exaggerate. A figure of speech that stretches the truth to create an effect, such as humor, is called hyperbole. Here are some other examples of hyperbole from Virgil's chapter.
Question
What mistake did Virgil and his father make, and how did Virgil feel about it?
They planted lettuce at the wrong time of the year. Virgil was mad
at his father at first, but then he felt sorry for him.