バズる (bazuru). They took the English word "buzz," turned it into a Japanese verb, and now it means exactly what you think it means. Your video blows up overnight? バズった (bazutta). A post hits a million views? バズってる (bazutteru). English borrowed "tsunami" and "karaoke" from Japanese. Japanese borrowed "buzz" right back and made it sharper. This is 若者語 (wakamono-go), youth slang. The kind of vocabulary textbooks won't teach you for years, if ever.

But on learn.japanology.nl, it's right there alongside 30,000 other words, graded from absolute beginner to native-level slang like this one. その動画、面白すぎて一晩でバズって、今や100万回以上再生されてるよ。 Sono dōga, omoshirosugite hitoban de bazutte, ima ya hyakuman-kai ijō saisei sareteru yo. "That video was so funny it went viral overnight, and now it's been viewed over a million times. " Could you read that sentence? If yes, learn.japanology.nl has thousands more waiting for you.