As an ESL: “IKR” aka “I know, right?”. I thought it has kind of passive-aggressive/sarcastic undertext, meaning something more of a “bro cmon this is obvious/trivial”, while it’s actually seems to be quite the opposite - emphatic affirmation of someones excitement about something. Keep in mind, I’ve never heard it IRL as I rarely talk to native speakers IRL, it was just a wrong impression from chats and online discussions.
Enjoying afroperuvian sound excursions of Mapambazuko by Ale Hop & Titi Bakorta.