BALTIMORE -- Boston Red Sox designated hitter David Ortiz acknowledged Wednesday that he has a promotional deal with Samsung but insisted that his selfie with President Barack Obama on Tuesday was spontaneous and not a marketing stunt.

"When people went crazy over that, you don't get to see anything like that every day," Ortiz said in the clubhouse before the Red Sox took on the Orioles at Camden Yards. "It wasn't anything promotional, anything like that. I mean, who knows that you're going to take a picture with the president? How many people can guarantee that? It was something we don't even have to talk about."

Upon being handed an honorary Red Sox jersey by Ortiz at Tuesday's World Series celebration at the White House, the president pulled Ortiz close to him and motioned toward photographers to "get a good picture."

After the two posed and photographers started snapping away, Ortiz reached into his pocket and asked, "Do you mind if I take another one, with my own?"

"He wants to do a selfie. It's the Big Papi selfie," Obama joked, getting laughs from players and spectators in attendance.

Ortiz said Wednesday it was a genuine once-in-a-lifetime moment.

"It just came out right in the moment when I gave him the jersey and he asked to take pictures," Ortiz said. "It was like, 'Oh, wait a minute, let me see if I can get away with this.' I was lucky that I was right there. It was fun. It was something I'll never forget."

Shortly after Ortiz tweeted the photo, which went out to his more than 630,000 followers and was retweeted nearly 40,000 times, Samsung retweeted it as well. The company later told the Boston Globe it "was an honor to help [Ortiz] capture such an incredible and genuine moment of joy and excitement."