Definition from Wiktionary, the free dictionary
muggins (plural mugginses)
- A fool or idiot (especially as an ironic way of referring to oneself).
- I suppose muggins here will have to do all the work, as usual.
- (cribbage) The act of stealing another player's points because they either mis-pegged or counted up incorrectly. House rules specify whether the mugginser gets the mugginsee's points or whether those points are simply lost.