gadfries
A loud and angry "gads" you make when something is so bad you want to punch it.
I saw my brother eat a worm and said "gadfries!" like I was going to hit him.
My friend told me a joke that was so bad I yelled "gadfries!" like I wanted to scream forever.
When my cat knocked my soup over, I said "gadfries!" like I wanted to punch the universe.