Watson pulled away from Jordan Spieth and Jonas Blixt to win at Augusta National, shooting a three-under 69 to add the 2014 Masters title to his victory in 2012.
The 35-year-old American joined the likes of Seve Ballesteros, Bernhard Langer and Jose Maria Olazabal as two-time winners of golf's most famous tournament and Watson clearly struggled with the enormity of his achievement as he donned his second green jacket.
"It's overwhelming," Watson said.
"To win twice, to be with those great names...a small-town guy named Bubba now has two green jackets. It's pretty wild."
As Watson finished his round with a par at the 18th, his son Caleb shuffled onto the green to be picked up by his dad, who failed to hold back tears.
When Watson won his first Masters, his wife Angie was unable to attend with their son, who had only been adopted a week earlier, and the world number 12 was not apologising for showing his emotions.
"Yeah I'm going to cry because why me?" he said.
"Why Bubba Watson from Bagdad, Florida? Why is he winning? So I just always ask the question why. Why me?
"That's why I'm always going to cry. I'll probably cry again tonight sometime, just thinking about it.
"I got lucky enough to have two green jackets. It's amazing to be up here one time to talk. A second time is amazing."
Watson conceded he enjoyed his walk down the 18th much more than two years before, when he needed a sudden-death play-off to defeat Louis Oosthuizen of South Africa, after missing a birdie for the title on the last regulation hole.
"This one was a lot better for me and my nerves and my family," the American said.