mug ‧ gins /ˈmʌɡɪnz/ BrE AmE noun [uncountable] British English spoken informal
[ Date: 1800-1900 ; Origin: Probably from the name Muggins , linked with ⇨ ↑ mug 1 4 ]
used humorously to mean yourself, when you feel stupid because you have let other people treat you unfairly:
Everyone disappeared after supper, leaving muggins here to do the washing-up.