The 31-year-old held his nerve at the last to score a brilliant 97.75 points and snatch the title from Japans Ayumu Hirano, who was leading on 95.25, with Australias Scotty James third on 92.00.
It was particularly satisfying for White, known as "Flying Tomato" because of his red hair, who won gold in 2006 and 2010 and helped put the hipster sport on the map, but flopped in Sochi four years ago.
"Oh man, that was awful and amazing at the same time. I knew I did a great ride and I was proud of that and I could walk away with my head high, but when they announced my score and Id won, it crippled me," he said.
"I was so overwhelmed with happiness, Ive been through so much to get here. I had this crazy injury in New Zealand (in October) where I busted my face open.
- Im still shaking -
=======================
Japans Hirano had to settle for a second silver in a row and James, a two-time world champion, saw his victory hopes dashed as he fell on his final effort.
Team USA are threatening to clean up in snowboarding in South Korea, winning all four competitions so far.
The 17-year-olds Chloe Kim and Red Gerard, and fellow American Jamie Anderson, have all won in Pyeongchang, where competitors have struggled with blustery winds.
He has been determined to show snowboardings next generation that he is no spent force after scoring a controversial perfect 100 in Colorado last month that sparked accusations of favouritism.
White called his winning run in the tricky conditions in South Korea "one of the most challenging Ive ever done" because of the combinations he pulled off.
His watching family were "beside themselves", he said.
"Im still shaking, I dont know whats happening.
"Man, three gold medals. My fourth Olympics. Thank you, Im feeling blessed." Scott Blackmun, chief executive of the US Olympic Committee, paid tribute to the Americas Winter Games champions over the years, starting with speed skater Charles Jewtraw at the inaugural edition in 1924.
hese medals have spanned nearly 100 years and showcase the dedication to excellence that is central to Team USA and the entire US Olympic family.
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