Definition of "muggins"

muggins

/ˈmʌ.ɡɪnz/

noun
countable and uncountable, plural mugginses
1. (especially as an ironic way of referring to oneself) .
  Quotations
  "And I thought: if muggins here, a 37-year-old government minister who can look after myself, feels that way, then we need to really think about how we're putting in place a level of protection for women.
  2022 April 6, “Network News: Booze ban continues as part of move to prioritise women's safety”, in RAIL, number 954, page 6
2. (cribbage) The act of stealing another player's points because they either mispegged or counted up incorrectly.
3. (uncountable) A game of dominoes in which the object is to make the sum of the two ends of the line some multiple of five.
4. (uncountable) A card game based on building in suits or matching exposed cards, the object being to get rid of one's cards.