’Most all the time, the whole year round, there ain’t no flies on me,
But jest ’fore Christmas I’m as good as I kin be!

In this comic, dialect-voiced couplet, the speaker boasts that he is generally beyond reproach (“there ain’t no flies on me,” i.e., no one can fault or trick him), but admits to a seasonal burst of conspicuous virtue right before Christmas. The humor turns on the contrast between year-round self-assurance and a sudden, performative goodness prompted by social expectation, gift-giving, and moral sentiment associated with the holiday. Read as satire, it gently exposes how “being good” can become strategic and time-bound—less a steady character trait than a temporary posture adopted when it is most publicly rewarded or scrutinized.