瘦的只剩下肉
[shòu de zhĭ shèng xià ròu]
'瘦的只剩下肉' literally means 'Only Flesh Left from Being Skinny'. The phrase humorously or exaggeratedly emphasizes how extremely thin one is to a state where only the flesh and skin remain visible. People may use this kind of exaggeration in online names for self-mockery.