I get a little behind during Lent, but it comes out even at Christmas.

The line is a wry, self-deprecating joke about religious observance and human inconsistency. “Getting behind during Lent” implies failing to keep up with Lenten disciplines (fasting, abstinence, self-denial), while “it comes out even at Christmas” suggests that any shortfall is more than compensated by indulgence during the Christmas season. The humor depends on the contrast between a penitential period and a celebratory one, implying a moral “accounting” that is conveniently balanced by pleasure. Read more broadly, it satirizes the tendency to treat ethical or spiritual commitments as temporary, negotiable, or offset by later behavior rather than sustained practice.