Palumbo's stage name is derived from geôlier, French for "gaoler" translating in Italian as secondino, which is also a slang demonym for his native Secondigliano district of Naples.

In 2019, Geolier signed a contract with BFM Music,[3] founded by the rapper Luché, with which he released in October his debut album, Emanuele.

[6] On 6 January 2023, he released his second studio album, Il coraggio dei bambini, featuring collaborations with artists such as Sfera Ebbasta, Shiva, Guè, Marracash, Paky and Giorgia.

[9] The album was re-released as Il coraggio dei bambini - Atto II on 7 April 2023, with six additional tracks including collaborations with Giorgia and Marracash.

The song discusses themes of jealous and possessiveness in a relationship, and has been described as an urban ballad, telling the same story from three different points of view.