According to the database KnowYourMeme, the "It's Gonna Be May" trend originated in 2012 and continues to make the rounds every April 30 in the form of photos, videos and animated GIFs. The meme stems from a line sung by Justin Timberlake in the 2000 *NSYNC hit “It’s Gonna Be Me."
https://people.com/nsync-lance-bass-and-joey-fatone-on-its-gonna-be-may…