Estrujarme comes from the verb estrujar, which means to squeeze, crush, or wring out. It's a vivid and somewhat intense verb that isn't used in everyday conversation as frequently as more common verbs like abrazar (to hug).
In "Amor Narcótico," CNCO sings, "Cuando logras estrujarme con fascinación" (When you manage to squeeze me with fascination). Here, it's used metaphorically to describe the overwhelming and captivating effect of a passionate, almost suffocating love. It conveys a sense of being completely consumed and powerfully affected by the other person's presence and actions, making it a very evocative choice for the song's theme of a 'narcotic love'.
"Amor Narcótico" compares an all-consuming relationship to a drug. CNCO's narrator keeps circling back to the same idea: this love is a toxin with a narcotic effect, something that grips you exactly when you want to be free.
The lyrics lean into contradiction on purpose. The person being sung to is shy and typical in one line, then satirical and fanatical in the next; apathetic and lucid, romantic and brutal, calming and suffocating all at once. That push and pull is the point: the narrator knows the relationship is bad for them and stays anyway, repeating "te quiero así" (I love you like that) as both a confession and an excuse.
By the end, the song drops any pretense of resistance. There's no blame, no motive, no reason left to give: just the admission that this addictive kind of love has already won.