老公为什么螃蟹横着走老婆因为它有钳任性
[lăo gōng wéi shén me páng xiè héng zhe zŏu lăo pó yīn wéi tā yŏu qián rèn xìng]
The nickname humorously poses and answers a playful riddle: Why does a crab walk sideways? Because the wife (or partner) says 'crabs have clippers, and so can be wilful'. This kind of humorous, whimsical riddle-like nickname conveys playfulness in relationships or towards daily phenomena.