What is the definition of Pepsi123?

"Pepsi123" is the internet slang for "Pepsi's digital selfie," aka, a person who posts endless, pixelated selfies of themselves holding a Pepsi can, usually with a caption that reads, "Just when I thought I'd run out of good vibes, I found my Pepsi buddy."

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Now, here's a sentence that might send shivers down your spine: "With Pepsi123, I decided to prove my caffeine addiction was real, posting a series of selfies at 7 AM with the caption: 'I just woke up, my coffee's gone, and my Pepsi is a total mustache-twirling, 24-hour obsession.'"