They don't just get angry, they shout, they're abusive, they throw things, they issue threats, they attack people. They aren't just happy, they jump up and down with excitement, they tell everyone how ecstatic they are, they expect everyone to gush and enthuse.
This is what I would call over-emotional. Meaning not that you express too many emotions, or that you have an emotional reaction to just about everything, but that you act out your emotions instead of keeping them to yourself.
It must be terribly exhausting for those concerned. Isn't it enough to say you're angry and what you're angry about? Why go to such lengths to "prove" your emotions?
And yes, you've guessed it, I tend not to go that far. I usually express my emotions quite simply, without any fireworks - which rather disconcerts those who are more emotionally effusive.
So I'm rather bemused when someone on the telly is waxing euphoric about the meal they've just cooked, or the valuable antique they found in a junk shop, or their newly updated bathroom. You'd think they'd just won a fortune in the lottery (now that might well merit waxing euphoric).
People who make a meal of their emotions used to be unusual. They used to be dismissed as drama queens. Nowadays drama queens are two a penny and it's the emotionally reserved who're the oddballs.