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Eugene is saying that if he has a relationship with the Argentinian girl, there's no way to avoid the girl's sister getting jealous, or as it's said in the song, "There ain't no way around Jealous sister."
Eugene is saying that if he has a relationship with the Argentinian girl, there's no way to avoid the girl's sister getting jealous, or as it's said in the song, "There ain't no way around Jealous sister."