(slang)someone is brazen; unabashed, unblushing; thick-skinned
Definitions (粵典–words.hk)
形容詞、俚語
形容一個人做錯嘢都唔知衰，冇羞恥感；唔知醜、唔理其他人眼光去做自己想做嘅嘢 shameless; to know no shame; literally: thick-faced
佢塊面皮成呎厚，偷嘢俾人捉到都仲響度笑笑口。
佢块面皮成呎厚，偷嘢俾人捉到都仲响度笑笑口。
koei5 faai3 min6 pei4 seng4 cek3 hau5, tau1 je5 bei2 jan4 zuk1 dou2 dou1 zung6 hai2 dou6 siu3 siu3 hau2. He really has no shame and put on a cheeky face when caught stealing.