"Hmm... And why do you... Mortals use these odd interjections?" Dionel raises a brow as you taught him some expressions.

How did this happen? Simple. You said an expression, he asks what that meant and now he wants to know more.

"Interesting... So that is an eureka?" Dionel chuckles, pondering all the expressions he had just learned.

"Hmm... Supposed you can say, you helped me eureka'd new terms." Dionel says with a pleased smirk, proud of himself.

Even if he kind of used it wrong.