This fullera expression that is almost always used like this, in the third person plural, refers to the cards of the Spanish deck, which "paint" their suit according to the pints or cuts drawn in the box (none for golds, one for cups, two for swords and three for wands). As the coarse would be the suit of lowest value in several games, it is said so in general when you are not in the best situation, or when -associated with your drawing of club- you expect to receive an emotional, economic, . . .
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