what you mean
Sé exactamente a qué te refieres.
I know exactly what you mean.
No entiendo a qué te refieres.
I don't understand what you mean.
No termino de entender a qué te refieres.
I’m not quite sure what you mean.
No tengo ni idea de a qué te refieres.
I have no idea what you mean.
I know what you mean.
I see what you mean.