From Wiktionary, the free dictionary
Literally, “to put the nose in”.
meter la nariz (first-person singular present meto la nariz, first-person singular preterite metí la nariz, past participle metido la nariz)
- (idiomatic) to meddle, interfere
- Synonyms: meterse, inmiscuirse
- (idiomatic) to be nosy, to put one's nose in someone else's business