我忘了你姓刘叫刘不住
[wŏ wàng le nĭ xìng liú jiào liú bù zhù]
The meaning here is a little complex. The phrase implies someone’s name has become a distant memory because 'Liu' could be the surname and name but is no longer remembered. It suggests the forgetting of a specific person or past acquaintance with a certain name 'Liu'.