Green’s Dictionary of Slang

a small literary club.

1909

J. Ware Passing Eng. of the Victorian Era 102/2: D. T. Centres (Lit., 1880 on). Minor Bohemian, literary, artistic, and musical clubs-from the jollity, or supposed jollity, of a Bacchic character which continually proceeds within their walls. D. T. is a reduction to the absurd of delirium tremens.