Muggins

Part of speech: noun (n.)

1. A game of dominoes in which the object is to make the sum of the two ends of the line some multiple of five.

2. A game at cards which depends upon building in suits or matching exposed cards, the object being to get rid of one's cards.

Part of speech: verb (v.)

In certain games, to score against, or take an advantage over (an opponent), as for an error, announcing the act by saying "muggins."