Wow..so I think this can be negative meaning. I've found it in a material from internet. It's a programme about english words that are often mispronounced. one of the presenter said 'I'm feeling really mean today' and cuz they did said a lot of hard pronounced words, so I thought she could be feel ill(an exaggeration,I thought too much...)...or she feel interesting about this subject. and in the end, she's just tried to be naughty. silly me.