Pugnacious - inclined to quarrel or fight readily; quarrelsome; belligerent; combative
I have this word written on my notepad on my desk. I enjoy it. I'm frequently in a pugnacious mood. Poor Matt will say the wrong thing and I'm all over him. It's usually brought on by a bout of picking up socks from numerous places in the house that are not one of the many laundry baskets that are provided for that purpose.