The phrase comes from the long-running OwO what's this notices your bulge copypasta that parodies flirtatious furry roleplay chats online. Bolgy Wolgy is the deliberately misspelled, cutesy version of bulge, turned into an animation meme audio credited to Seelmaru. Animators on Flipaclip and similar apps began looping the clip over original characters acting out the notice, blush, and reaction beat. Its popularity comes from that shared format, where each new version changes the character design but keeps the same embarrassing setup and timing.