Kurulmam comes from the verb kurulmak, which means 'to be set up', 'to be assembled', or 'to be established'. The suffix -mam indicates a negative first-person singular future tense.
In the song, the lyric "Bi kere kırıldım / Bi daha kurulmam" translates to "Once I was broken / I won't be set up again." It's a powerful and somewhat unusual way to express emotional resilience and a refusal to be put back together after being hurt, giving the word a unique and memorable emotional weight.
"Mod" is Turkish for a mood, and Mustafa Sandal and Zeynep Bastık use the word the way you would describe a room you walked into and then could not find the door out of. The verses are an inventory of damage, and the vocabulary is mechanical rather than romantic — "Bozulup söküldüm" (I broke down and was taken apart), things that come apart and do not reassemble. What makes it land is the tense: "Bi daha kurulmam" (I won't be put back together again) is a refusal, not a complaint.
The chorus turns that private wreckage into a warning about a place. "Bi kere bu moda girdin mi / Çıkamıyosun bi tanem" (Once you get into this mood, you can't get out of it, my darling) treats heartbreak as somewhere you enter rather than something that happens to you, and the longer you stay, the worse the exit gets — first "Utanıyosun aşktan" (you become ashamed of love), then "Çekiniyosun aşktan" (you shy away from love). Sandal and Bastık trade these lines rather than answer each other, so the song reads as two people describing the same room from inside it.