Those are idioms. The anime kids were weirdly incorporating Japanese words into their communication with English speakers and doing kamehamehas in the hallway.
Here's something more analogous: A friend spent the summer before senior year in France and when she came back, you could not get through a conversation without her dropping a French word or relating something to "how they do things in France". And yes, we made fun of her until she stopped.



Yes but that's done naturally, not shoehorning it into conversation with people who have no idea what you're talking about