Magnus puts one hand in front of his chest and moves it like he's brushing upward on his breastbone. "This means happy," he says. It's technically only one way of saying it, but he thinks that probably the more informal expression of the word would be most appropriate. Then, he moves his hands next to his face, palms down, and draws them up like he's tossing something behind his ears. "This is overwhelmed." It's only a slight adjustment to show Claudius how to differentiate between overwhelmed in a good way, and overwhelmed in a bad way, and so he shows those variations next, and waits to make sure Claudius is keeping up.