Asqueroso is the common Spanish word meaning “disgusting.” ¡Qué asqueroso! is the common Spanish exclamation of disgust, as is its closely-related cousin, ¡Que asco!
Asqueroso (and asco) come from the Latin eschara, meaning, “scab” (which itself is from the Greek eskhara meaning the same).
From the same Latin (and Greek) root, we also get the English… scar.
So, in Spanish, something that is so disgusting literally scars you!
We can see the mapping in the s-qu-r of asqueroso to the s-c-r of scar.