/ ˈmʌgɪnz; NAmE / noun
[ sing. ] ( BrE , informal , humorous ) used without 'a' or 'the' to refer to yourself when you feel stupid because you have let yourself be treated unfairly :
And muggins here had to clean up all the mess.
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WORD ORIGIN
mid 19th cent.: perhaps a use of the surname Muggins , with allusion to mug .