Colasse is the imperfect subjunctive form of the verb colar, which means 'to glue' or 'to stick'. In this song, it's used in a hypothetical sense, meaning 'if I glued' or 'if I mended'.
It's a poignant word because the singer asks, "E se eu colasse o que parti?" (And what if I glued what I broke?). This line beautifully expresses regret and the desperate wish to repair a broken relationship, making it a powerful and memorable image within the lyrics.
This song drops you right into the middle of a very fresh breakup. The singer is miserable, admitting, "Há três dias que foste embora / Abro o WhatsApp a toda a hora" (It's been three days since you left / I open WhatsApp all the time). It's a super modern and relatable way to show someone is hoping for a message that isn't coming. They're wondering if they should try to fix things, asking, "E se eu colasse o que parti / Gritasse que ainda penso em ti" (And if I glued back what I broke / Shouted that I still think of you).
As the song goes on, the singer moves from just missing their ex to making a firm decision. They declare, "Eu já escolhi, agora és só tu" (I've already chosen, now it's only you). They're haunted by memories, like a specific tattoo and a message they can't forget. The line "Eu aqui e tu aí, olhando o mesmo céu / Mas tu levaste as estrelas contigo" (Me here and you there, looking at the same sky / But you took the stars with you) perfectly describes how empty their world feels. It's a song about realizing you've lost the one person who matters and deciding you're not going to let them go.