Erstick' is a shortened form of "ersticken", which means to suffocate or choke. It's a strong and evocative verb that immediately conveys a sense of intense distress and desperation.
In the context of the song, the singer uses this word to describe the overwhelming feeling of being consumed by thoughts of another person. They sing, "Fühle ich mich wie, wenn ich erstick'" (I feel like I'm suffocating), powerfully illustrating how the emotional burden is so heavy it feels physically constricting, making it a memorable and impactful word.
Have you ever felt so consumed by someone that you lose yourself completely? MilleniumKid's "Keine Luft" [No Air] perfectly captures that intense, almost suffocating feeling. He sings, "Und ich weiß, ich verlier' mich / Und ich weiß, du dich nicht" [And I know I'm losing myself / And I know you're not], highlighting a painful imbalance in affection. It's like he's disappearing, and even when he looks in the mirror, he only sees the other person: "Selbst im Spiegel sehe ich nur dich" [Even in the mirror I only see you].
The lyrics get pretty intense, with lines like "Reiß' mein Herz aus meiner Brust / Es ist so schwer, bekomm' kaum noch Luft" [Tear my heart from my chest / It's so heavy, I can barely breathe]. He literally feels like he's suffocating when he thinks about this person, saying, "Fühle ich mich wie, wenn ich erstick'" [I feel like I'm suffocating]. And the ultimate desire? "Wenn ich dich seh', will ich untergehen" [When I see you, I want to go under]. It's a powerful, almost desperate song about being so overwhelmed by someone that it feels like you're drowning.