Green’s Dictionary of Slang

drunk; thus buoyantly adv., drunkenly.

1919		O.O. McIntyre ‘New York Day by Day’ 22 Mar. [synd. col.] Between the cereal and the wheat cakes the buoyantly bunned guests danced.
2003		Drunktionary 🌐 Buoyant – High, happy. Or, because one’s teeth are floating. Buoyed.