it's all Greek to me
US /ɪts ɔl ɡriːk tu mi/
UK /ɪts ɔl ɡriːk tu mi/

1.
es todo griego para mí, incomprensible
something that is incomprehensible or unintelligible to someone
:
•
I tried to read the instruction manual, but it's all Greek to me.
Intenté leer el manual de instrucciones, pero es todo griego para mí.
•
When they started talking about quantum physics, it was all Greek to me.
Cuando empezaron a hablar de física cuántica, todo era griego para mí.