Green’s Dictionary of Slang

flit n.1

[brandname Flit, an insect repellent spray]

(US prison) prison-made coffee.

Show quotations
[US]Goldin et al. DAUL 71/2: Flit. (New England prisons) Weak prison coffee.
[US]Bentley & Corbett Prison Sl. 67: Flit also Mouthwash, Spow Old term for coffee.