When in a setting where you really shouldn't
say naughty words -FUCK, especially.
You can simply say indeed instead... and it's basically like saying "FUCK YESSSS!" Only, polite enough for grandparents to hear and not have a stroke.
"Well, I decided to get you unlimited
texting and a brand
new car, oh, and a sculpture of cheese, like you
always wanted.."
"indeed!"