MetalKingBoo is a youtuber responsible for the creation of the "X Screaming" series, where they distort audio of video game characters to make them sound like they are screaming. Among them, SimpleFlips likes Mario Screaming 1, 2, and 3 the most. One video that SimpleFlips hates the most from MetalKingBoo is "Sonic Screaming", with the gay idiot claiming that the video gave him cavities. (as shown in "This BUP is DISGUSTING") a possible connection to Mariofan888 is currently unknown, although rumors are going out that Mariofan888 and KingMetalBoo are planning to make a world-ending oatmeal, with "SimpleFlips Screaming". MetalKingBoo also has created many "BUP" music tracks, such as
He is also responsible for creating the OST to the Releasio 64 ROM hacks.
The heavy usage of BUP could foreshadow MetalKingBoo trying to supply proper adhesive to Toad.
SimpleFlips' face after hearing Sonic Screaming, but before he got cavities