She answered the phone and, to her great 'joy', heard her son's voice on the line. [=she felt very happy when she heard her son's voice]
“You've spent hours looking for it. Any 'joy'? [='luck']” “No 'joy' whatsoever, I'm afraid. I can't find it.”
They were 'shouting/jumping for joy'. [=they shouted/jumped because they were very happy]
(..) I'm going to be king of Pride Rock. Oh goodee. My Dad just showed me the whole kingdom, and I'm going to rule it all. Heh heh. Yes. Well... forgive me for not leaping for joy... Bad back, you know. Hey, Uncle Scar? When I'm king, what will that make you? A monkey's uncle. Heh heh. You're so weird. (..)1994 The Lion King