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if you talk to him earlier in the game, he'll mention how he's feeling down so he combined lucky + happy into luppy to be luppy. this dialogue is missable and he will permanently switch to the luppyluppy line after a certain point in the main story without any care for if you heard the first part

it's basically untranslatable without just writing an entirely new line, yeah. "luppy" is a wasei-eigo construction (lucky + happy) that would only make sense to a jpn speaker to begin with, "doubling it" to make "double-lucky-happy" only makes sense AT ALL in japanese