(adjective) to want more than what one can eat / take in; to be overly greedy; to bite off more than one can chew; ; literally "eyes bigger than your stomach"
Definitions (粵典–words.hk)
語句
以為自己食得落，實際上唔得 to overestimate one's appetite; lit., eyes are bigger than one's stomach
你唔好眼闊肚窄喇，咁多邊食得晒！
你唔好眼阔肚窄喇，咁多边食得晒！
Don't overestimate your appetite, how can you finish so much?
Definitions (Wiktionary)
phrase, Cantonese, idiomatic
bite off more than one can chew
Definitions (Kaifangcidian)
眼大肚子小
口大喉嚨小 – 口大喉咙小
眼饞肚飽 – 眼馋肚饱
Examples (粵典–words.hk)
Cantonese
你唔好眼阔肚窄喇，咁多边食得晒！
你唔好眼闊肚窄喇，咁多邊食得晒！
Don't overestimate your appetite, how can you finish so much?