tittery, n. — Green’s Dictionary of Slang

tittery n.

[dial. tittery, unstable, on the verge of falling, i.e. its effects]

gin.

1725		G. Smith Compleate Distiller in Dowell Taxes in England iv 103: Gin... sold under the names of double geneva, royal geneva, celestial geneva, tittery [F&H].
1731		in Bailey Universal Etym. Eng. Dict.