Sentence:  "Listen, Mikey," she said, "when somebody tries to bully you, just punch him on the end of the nose the way you did old Panfilo. ... [Y]ou be just as mean as you want to be and at least give him his <WSD>money's worth</WSD>. 
Meaning of the word marked with <WSD> tags:  Recompense or just deserts, especially as resulting from dealing with a perceived injury or injustice.