"Grazie
al cazzo" or "E grazie
al cazzo" ,
Italian expression that used to say that what someone has just said is a banality, is an obvious concept (that everyone knew)
Litteraly, "Grazie al Cazzo" is "Thanks the dick! " ( you have to thank your dick for this idea, not your brain) and meaning: " it's obious !"
examples:
A: i'm a
human
B: Grazie al cazzo ! i
don't think you are an insect
A: If i shoot myself in the head, i will
die
B: e grazie al cazzo, you're not immortal