En que estaría pensando
This appears to mean "what was I thinking / what was he / she / it thinking. But it doesn't seem to make sense if you think about "estaría". It looks like "What would I be thinking" but that makes no sense. I don't get it.
Gracias.
2 Answers
I think that it would be more along the lines of
What could he have been thinking? or
What could have been going through his head (when he decided to pull that bone-headed maneuver)?
The equivalent in English would be What was I/She/He thinking? Don't let the use of the conditional in Spanish throw you off. There's no one-to-one translation here since this expression has become idiomatic due to his frequent use.