to stick one's nose in, to butt in
Ninguém pediu sua opinião, pare de meter a colher na vida dos outros!
Nobody asked for your opinion, stop sticking your nose in other people's business!
The image behind meter a colher ("to stick the spoon in") comes from the kitchen and the shared table: dipping your spoon into a pot or dish that someone else is tending. Doing so means interfering where you were not invited, which is exactly the figurative sense — butting into other people's business.
Falando's Idiom Trainer teaches you to recognize idiom meanings and create sentences using them, so you can speak like a Brazilian.
