我姓甘我心肝
[wŏ xìng gān wŏ xīn gān]
The nickname is a humorous play on words. In Chinese, '甘' (Gan) can mean 'surnamed Gan', and the phrase also suggests someone who willingly (心甘情愿 xīngānqíngyuàn) dedicates themselves to something. It's an expression that combines a person's surname with dedication.