Quelff
I deep sigh or either pleasure, or plain relief.
I quelffed so hard after I finished than math exam.
Quelff
A heavy sigh or breath.
Dude, I had the biggest quelff after that test.
quelff
A deep sigh, or breath, usually either in pain, anger, or pleasure.
"Dude I was so happy to finish that test that I nearly quelffed."