(slang) to feel nervous about something; keyed up; to be very involved; to worry about; to feel anxious about; to care a lot about something; to be very concerned about something
Definitions (粵典–words.hk)
形容詞
對某樣嘢非常緊張,好珍惜 to be greatly concerned about; extremely devoted to; literally "flesh tight"
佢好肉緊佢部手提電話。
佢好肉紧佢部手提电话。
keoi5 hou1 juk6 gan2 keoi5 bou6 sau2 tai4 din6 waa2 She's very concerned about her mobile phone.