Always hated the boy, but now the boy is the man
Mothafucka, I done grown up!
Bwoy (pronounced boy) is a Toronto slang word for cops similar to pigs, originating in Scarborough, which Drake makes clear he still has a connection to throughout the album. Drake denotes how he used to hate the cops. So the line is a also a play on words.
To help improve the meaning of these lyrics, visit “Worst Behavior” by Drake Lyrics and leave a comment on the lyrics box