fuh-SHAO

For certain, surely, absolutely, definitely, I would love to, HELL YEAH

Much emphasis is put on the last syllable. It can also be spelled as 'fuh-SHAW', 'fSHAW' or 'fSHAO'.

"Dude, are you coming with me tonight to see Fantastic Mr. Fox?"

"Fuh-SHAO!"

"Awesome!"