alanback: I'll try to translate the phrase "ВЯРНО, ПЪЛНА СВИНЩИНА" word by word, then will give you its possible meanings:
Вярно = True, agree
Пълна = Absolute, Complete, Entire
Свинщина = Squalor, Filth, Swinnish/dirty trick, Mess

Versions:

1. "I agree with you, this is absolutely dirty trick."
2. "That's true, it was very/extremely hoggish."
3. "Oh yes, we completely f**d up!"
4. "F**k me, I was so unlucky this game!" --> this is the most accurate translation, as I asked the player (N.Nakov - autor of the phrase in question) and he explained the situation to me personally. It's about this game. Unfortunately it is Private and not available for viewers. I can ask for game's code if anyone is interested.

Shortly, the player curses his own bad luck.

Hopefully, this helps. Good luck