Sobre llovido, mojado

Sobre llovido, mojado
 

The meaning of this phrase is asked in the online episode of Preguntas fáciles that was recently offered as a sample here. Both the host and contestant got it pretty wrong. It was defined as meaning "more of the same (@&#)". It hardly is.

The idiom is "llover sobre mojado" which means more troubles of any kind have risen when one was still dealing with a whole lot of previous troubles.

People in Argentina often express that as "..., sobre llovido, mojado, pasó xyz". It is in a fashion a way of saying "and as that wasn't enough, this happened".

The local way to say "More of the same" is "otra vez, sopa" as a complain

About unexpected complications that emerge while we're still managing a lot of troubles, we protest using the ironic phrase "¡Éramos pocos y parió la abuela!" (pocos really means "too many" in this phrase)

How would you say all these phrases in English?

When it rains it pours.
Just when you thought it couldn't get worse.
Murphy's law. (If something can go wrong, it will.)

When something goes wrong unexpectedly on top of a series of bad things, you may say that adds insult to injury. Example, I rushed to the hospital after hearing that mom had a stroke, and on the way had a flat tire-- and it was raining. That added insult to injury!

Excellent! Thank you, poli!

I'm gonna research a little about those expressions so to learn about their scopes.