The joke from "The Simpsons" involving the sign "Sneed's Feed and Seed (Formerly Chuck's)" is an example of the show's subtle humor that often requires a bit of thinking.

The humor in the joke arises from the phonetic similarities between the words and the implied names of the businesses. If "Sneed's Feed and Seed" is consistent with the naming convention of rhyming the owner's name with the type of store, then "Chuck's" would have rhymed with the subsequent words as well. 

Without saying it outright, the joke implies that Chuck's store was called "Chuck's [rhymes with 'Feed and Seed']." Given that "Chuck" rhymes with a particular colloquial term, the joke plays with the potential off-color humor of what Chuck's business might have been called, while never actually stating it.

This is a typical example of how "The Simpsons" often embeds jokes into the background or delivers them in such a subtle way that they might be missed on first viewing.
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