This means combative or belligerent. Here are some sentences. He has a pugnacious nature, and always ends up in a fight. Her dog is pugnacious, and I'm afraid he'll bite me. A pugnacious attitude...
I've never heard of the word, "pugnacious."
The young student's "quick to fight" nature was described as overly pugnacious to the school's principal by the child's teacher .
"I would like to return the gift you gave to me." "I understand you are trying to help me." "I don't get why this is always happening to me." I really hope that aunt shelly will get ME a great gift...