I never heard about the Kesha fingerbang, but he did tell me once that Kesha gave him a half a handjob to which my friend responded "I hope it was the second half."
Boosh did take me to a Kesha party in a hotel room once in LA though where Snoop Dogg's DJ told me all about buying heroin in different countries, almost pushed me off the second story roof, and Kesha's friend gave me shit for throwing a glass off the roof onto another roof and then trying to steal a full bottle of "Kesha's" Grey Goose.
I made off like a bandit with Kehsa's minty dental floss though.