Bàngōngshì wénjiàn luànmámá, zhěnglǐ le yī tiān cái gǎodìng.
The office files were all a tangled mess - it took a full day to sort them out.
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麻 here evokes a knotted clump of hemp fibers. Picture trying to untangle raw hemp and you have the feeling of 乱麻麻 - compare the longer 乱七八糟 for general mess.
