Burdensome
A horse that is fat is a burdensome animal.
A fat horse. So burdensome. Not to mention the burden on the horse on top of the fatness.
だ, た
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But you have to be nice to the burdensome horse because this horse is your dad (だ).
Go visit your dad the burdensome horse because you have to visit your dad. It's weird because you're a human and he's a horse.