It's a reference to a line from the episode "Our Mrs. Reynolds". Basic story:
The captain is surprised with a wife (right after the title sequence).
(Halfway through the show) Jayne Cobb offers to trade his favorite gun for the wife. (The gun's name is Vera.)
P.S. I don't have the DVDs at hand, so I can't quote that scene completely. But lines like that are why I love that series.
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