The phrase c'est l'électricien simply means it is the electrician in French, and the humour comes from treating that everyday announcement like a catchphrase. The elongated ending turned the short line into a shareable soundboard clip in French speaking online spaces, where it is reused as a reaction to arrivals, door knocks and surprise entrances. Because the meaning is clear even to listeners who know a little French, the clip travels well in edits, gaming videos and short form posts built around a sudden reveal.