Funky is one of the skins released under the Party part of the Agar.io Birthday offer. It was available for purchase in mid July 2017.
Funky could be purchased for $4.99 as part of the Regular Pack. This pack also included the Odd skin and 3250 coins. Funky was not available for individual purchase and may not be available for purchase in the future.
Details of this offer may vary depending on location and platform.
Note: Funky was released again as part of The Collector's offer in January 2018.