Капкан literally translates to "trap" or "snare". It's a vivid and somewhat dramatic word that stands out in the lyrics.
In the song, the singer uses it metaphorically to describe his beloved, singing "Ти мій капкан, і я в нього попав" (You are my trap, and I fell into it). This expresses how he feels irresistibly drawn to her, caught in her charm, and unable to escape her influence, highlighting the intensity of his feelings.
Parfeniuk's "Де Би Ти Не Була" [Wherever You Are] is a really passionate song about searching for a lost love. He's clearly head-over-heels, even admitting, "Ти мій капкан, і я в нього попав" [You are my trap, and I fell into it]. He describes his voice, "п'яний по дворам" [drunk through the courtyards], as he desperately looks for her everywhere.
He feels like half of his heart is with her, saying, "Половина серця в твоїх руках" [Half of my heart is in your hands]. He's been searching for someone like her for so long that he's gotten lost, "І у пошуках цих я заблукав" [And in these searches, I got lost]. It's a powerful feeling of being completely consumed by love, even when it feels like a trap he can't escape.