Meghan Trainor and Charlie Puth Were Just as Shocked as We Were by Their AMAs Makeout

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Charlie Puth is dishing on that Meghan Trainor makeout session at the AMAs that had everyone talking.

The two locked lips (and Puth grabbed Trainor's butt) for 15 loooong seconds during their performance of Puth's song, "Marvin Gaye," and the 23-year-old singer tells USA Today that they couldn’t believe what they had just done.

"At first, we were like, 'Holy sh*t, what did we just do?'" Puth explained, saying that he and Trainor laugh about it now. "I have a girl kind of in my life right now that I'm not making too public and I don't want people to get the wrong idea."

WATCH: Meghan Trainor Totally Made Out With Charlie Puth On Stage at the 2015 AMAs

"But without Meghan's initial push, I wouldn't really be anywhere," the singer continued. "Meghan really helped me by being featured on my first record."

So, what was the thought process behind the makeout session in the first place? Well, PASSION, basically.

"When we were doing it live, we were like, 'OK, this one of the more major live performances. How are we visually going to show this and make it as impactful as the video?'" he said. "We were like, 'Should we kiss?' Meghan is literally like my best friend, so it was a little weird at first, but it added something to the visual element of the performance, for sure, and that's an important part of it since America was watching."

And watch we did.

WATCH: Meghan Trainor's New Music Is Inspired by Her 'Curves' and Her Dad's Killer Dance Moves

Trainor laughed off the moment on Instagram, writing, "All about dat ass grab doe @charlieputh proud of you Charlie ? #imsingle."

Before the show, Puth confessed to some pre-show nerves.

"I'm keeping calm right now," he told ET, "but when I get on stage, I'm knocking over that piano bench and going, 'Ahh! Let it go.'"

WATCH: Meghan Trainor Gets Candid About Body Image in Hollywood

Meanwhile, Trainor told ET last month that her career can oftentimes hurt her in the love department.

"Even without the fame, if I walk into a room -- I kind of have that personality where I just take over the room," the "All About That Bass" singer said at the time. "I'm like, 'Hey! M-Train's here! What's up!' Which is very intimidating for guys alone, and then on top of [that] being a pop star -- I get it. I don't think they're less interested, I think they're just intimidated."

"It's fine, I'll wait for him," she joked about finding the right one. "[I'm looking for] someone who's a gentleman, someone who opens that door. A dude pulled out a chair for me the other day and I was like, 'Whoa! OK, nice!' That's new for me. I liked it. And if they're funny, that's awesome."

Watch that AMA lip-lock moment below.