Gem Nicknames
Gem nicknames are collective names given to various Steven Universe characters by the fandom. The most prominent are “Birdmom” (Pearl), “Squaremom” (Garnet), “Green Space Dorito” sometimes just called “Space Dorito”, “Lime Dorito” or “Green Dorito” (Peridot) and “Big Buff Cheeto Puff” (Jasper), although “Moist Mom” sometimes called “Wet Mom” (Lapis Lazuli) is also starting to take a rise in popularity.
Origin
While there is no clear origin, as-of-current, many speculate that the meme originated from a violation-attempt on the Steven Universe Wiki, where an anonymous-editor switched the names of various characters for their own nicknames for said characters.