Bubbabutt is one of the three skins released in one part of the Gottems offer. It could be purchased as part of an item deal for a limited time in early March 2021.
Bubbabutt could be purchased for $14.99 in the "Best Deal!" which included 15000 coins, 1000 DNA, one 2x Mass Boost (24 Hours), one 2x XP Boost (24 Hours) and the Chikadahr skin. Bubbabutt was not available for individual purchase and may not be available for purchase in the future.
Details of this skin can vary depending on location, platform or time.