In informal British English, muggins is a humorous way to say “me”, when you feel a bit stupid because you let other people treat you unfairly — you said yes, you did the extra work, you paid, and now you are the one left holding the problem. “And muggins here had to tidy up.” You almost always use it of yourself, with a small bitter laugh, not as a hard insult thrown at someone else. It is spoken, a little old-fashioned, and not for formal writing. The origin is unknown. The “fool” sense is old British slang from the 1770s, probably grown from mug meaning “fool”; some game uses may come from the surname Muggins. Though actually, many students meet it only in stories or sitcoms, not in Taiwan daily English, so it can sound dated even to young British speakers.

自嘲「倒楣的我／這個傻瓜」（英國口語，指自己被佔便宜還幫忙）