"Songwriting is an artist's way of expressing their journal and their personal life," the 26-year-old explained. "I don't really do much speaking on my personal life, so the fact that I get to probably answer a few questions -- people are wondering what I'm thinking about -- so it's nice to be able to put that out there."
Jonas teased that we'll "definitely know" who his new angry song is about when we hear it. Perhaps it could be about Gigi Hadid -- whom he dated for a few months last summer -- as many fans guessed in their replies to the "Cake by the Ocean" singer's original tweet? Hadid started dating former One Direction member Zayn Malik in late November, just a few weeks after she split from Jonas.
"As of right now, you'll definitely know who it's about [when you hear it,]" he confirmed. "But sometimes you have to sugarcoat it so it's not so obvious."
Jonas told ET that he and his pop-rock band -- which is also made up of Jack Lawless, Cole Whittle and JinJoo Lee -- are currently working on their first full-length album. And get this -- they're already hoping to release it sometime this summer!
"I would say August, late August -- and we're just grinding away in the studio," he said. "I'm going into the studio right after this to finish a track, so there's a lot of exciting new music I’ve been working on that isn't on [our 2015 debut] EP [SWAYY]."
"I feel like we've evolved quite a bit even from that -- which was really recorded early last year -- so now, a year later, I feel like it's nice to be able to release almost a new album in a way, when you've had time to progress," he continued.
DNCE is also gearing up to open for Selena Gomez on her Revival tour, which kicks off next month in Las Vegas. Jonas told ET he's looking forward to performing on some of the same stages he once shared with his brothers, Nick and Kevin, when the trio was on tour together as the Jonas Brothers.
"It's going to be a big tour, 50 shows, we're going to all these different cities," he dished. "I haven't played some of these venues in years, [so] I'm looking forward to it."
He was equally as stoked to be at WE Day, specifically because the message holds a special meaning in his heart.
"WE day has always been something special to me," Jonas gushed. "It is a room full of young, amazing, inspiring kids encouraging each other and I think that's what's great about it. Every time I leave here I feel like I'm a bit of an underachiever, but also I leave, like I said, very inspired."
"And I want to help out -- do whatever I can do," he continued. "They're the future, and the fact that they're young and so inspired this young is awesome."
Earlier this week, Vogue magazine released photos of Jonas' ex-girlfriend packing on the PDA with Malik in Naples, Italy, for a stylish photoshoot for the glossy's May issue.
To hear more (and see the stunning pics!), watch the video below.