: The duality of the word—meaning both "not mine" and "strange"—and how Bulgarian authors use it to describe the feeling of being an outsider in one's own life or community.

A paper could focus on how ToTo H's "Chujdi usmivki" marked a shift in the Bulgarian music scene, blending hip-hop with emotional storytelling.

: How the song uses the metaphor of "foreign smiles" to represent the alienation one feels when a shared intimate world becomes public or belongs to a stranger.

A paper exploring the linguistic nuances of the word "Chujdi" (Foreign/Alien) in Slavic literature.

: Genius Lyrics & Bio provides context on the song's meaning. 2. Psychological Perspective: Social Comparison

ToTo H – Чужди Усмивки (Chujdi usmivki) Lyrics - Genius

You could write about the "Social Comparison Theory" through the lens of the phrase "seeing others' smiles."