thinking about kghn boyfriends except kageyama is years older & is worried hinata's friends won't like him when they meet for dinner, so he brushes up on slang words the "kids" use these days. the dinner comes by, and kageyama takes this chance to show off what he's learned.
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he tests it out, sees that they respond positively, and continues to use all the slang words he's learned. it ends up with him being all over the place with his words. hinata's friends end up getting confused, but no one says anything for the rest of the night.