This expression describes a person who wants to quarrel (looking for a fight - peleador). We generally ascribe this attitude to feelings of having been wronged (resentful). This is why I associated it with estar resentido / rencoroso.
Synonyms of the expression are:
beligerant, combative, contentious, disputacious, opinionated, quarrelsome or touchy (although 'touchy' sounds a tad weak)
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