See also: 煠熟狗头
to fry in fat or oil; to scaldfamiliar; skilled; ripe; done; cooked dog head; (noun suffix) trad. (煠熟狗頭) 煠 熟 狗 頭 simp. (煠熟狗头) 煠 熟 狗 头 alternative forms 熠熟狗頭／熠熟狗头
Literally: “boiled dog's head”.
From the appearance of a boiled dog's head with teeth fully exposed and eyes closed.