Honestly this sounds like it's used for a replacement. In many regions of the country people won't cuss, so they'll use replacements. This is probably one of them, so I don't think there is a specific meaning.
@66kdrama @berrybee Thank you very much :) It was actually from an animation called Space Racers in which characters of bird-shaped spaceships coming out. I thought it as some technical thing. Now I see why he said 'leaping lugnuts.'
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