mutt
/mʌt/noun
informal
1
- humorous or derogatory a dog, especially a mongrel〈幽默或贬〉狗（尤指杂种狗）。
2
- a person regarded as stupid or incompetent笨蛋; 无能的人：
he pitied the poor mutt who ever fell for her charms.
他很同情那些被她的美貌迷住的可怜傻瓜。
词源
late 19th cent.: abbreviation of MUTTONHEAD.