A "merds" is a wild wild creature. She is very soft but denies it. SIMP. But everyone loves a cutie little merds, because her name is merds. Merds love to do her homework. Merds = Nerd. Don't give away a merd, she's special! Merd's love science and they have high aspirations in life (and good chemistry in bed ;))
Dio merda is a particular Italian expression, used when a man's anger reaches an unbelievable level.
Ho bisogno di un aiuto, Dio merda!
Sara hai rotto il cazzo dio merda!
What are you talking about? Dio merda is the only word you can say?
Dio merda, dio merda, dio merda, Palissandro mi ha bocciato!
Daniele guardami negli occhi, dio merda, stai studiando? Tra una settimana hai l'esame porco dio.