gone off fudge cake

When you leave fudge cake out too long and it goes moldy.

The gone off fudge cake tastes like shit.

gone off the deep end

go mad; behave extremely strangely.

"they looked at me as if I had gone off the deep end"

gone off ham

When you leave ham in the fridge for too long and it goes moldy.

The gone off ham tastes like dead skin.

gone off porridge

When you leave porridge out for too long and it goes rotten.

The gone off porridge tastes like shitty oats.

gone off cabbage

When you leave a cabbage in the fridge for too long and it goes rotten.

The gone off cabbage tastes like a stink bomb.

gone off goat cheese

When you leave goat cheese out for too long and it goes stale.

The gone off goat cheese smells like salmonella.

gone off pizza

When a pizza goes moldy.

The gone off pizza tastes like rotten eggs.