Brotei is the past tense of the verb brotar, which literally means "to sprout" or "to bud" like a plant. However, in Brazilian Portuguese slang, especially in funk music, it's commonly used to mean "I showed up" or "I popped up" somewhere.
In the song, the lyric "Eu brotei no baile da Colômbia pra te conhecer" means "I showed up at the Colombia party to meet you." It gives a casual, almost spontaneous vibe to his arrival, making it an interesting and authentic piece of modern Portuguese slang.
"Eu Não Vou Embora" ("I'm Not Leaving") is a Brazilian funk track by DJ Zullu featuring MC G15 and Anitta. The singer shows up at a baile, a funk block party, in a place called Colômbia, and instantly feels at home there.
The hook repeats the title line over and over: whatever happens, they are not leaving, this party has become their home now. It is a playful, confident dance track rather than a story, built around a simple call-and-response hook and "ah, ah, ah" sections made for the crowd to sing along to.