Green’s Dictionary of Slang

letty n.1

also lattie, latty
[Ital. letto, a bed]

(Ling. Fr./Polari) a bed; a room; thus letties, lodgings, accommodation; thus lattie on water, a ship; lattie on wheels, a carriage or automobile.

[UK]Hotten Dict. of Modern Sl. etc.
[UK]T. Frost Circus Life and Circus Celebrities 279: ‘Letty’ is used both as a noun and as a verb, signifying ‘lodging’ and ‘to lodge’.
[UK]Newcastle Courant 25 Nov. 6/5: She can strike the jigger to regular tradesmen like ourselves while the omee lies in letty and dreams.
[UK]P.H. Emerson Signor Lippo 45: ‘But I say, Blower, how about letty?’ ‘Kip for you two, eh?’.
[UK]J. Ware Passing Eng. of the Victorian Era 173/1: Mange, letty, bevy and clobber. Italian – through the organ-grinders’ lodging-houses. Eating, bed, drink, clothes – this last word being Hebrew.
[UK]P. Hoskins No Hiding Place! 191/1: Letty. Lodgings.
[UK]F. Norman Guntz 99: One of them [...] mentioned that he wouldn’t mind lumbering the matelot up his lattie.
[UK]R. Hauser Homosexual Society Appendix 3, 167: Latty, flat, room.
[US]B. Rodgers Queens’ Vernacular 124: latty (Brit gay sI, fr Parlyaree, // It letto = bed) room or apartment; pad, and therefore also the bed or the room it is in.
[US]Maledicta IV:2 (Winter) 233: Bless this lattie / Strong and stout / Keeping all the naph / Omis out.
[US]M. Coward in Verbatim 24:2 n.p.: If something is naff, you would want to put the mockers on it [...] You certainly wouldn’t want anything naff where you live, in your lattie.
[UK]P. Baker Fabulosa 294/1: lattie a house or flat [...] lattie on water, a ship; lattie on wheels a carriage, car or taxi.
[UK]P. Baker Fabulosa 294/1: letties lodgings.
[UK]P. Baker Fabulosa 294/1: letty 1. a bed. 2. to sleep.
[UK]R. Milward Man-Eating Typewriter 58: A dizzy mushroom cloud rose as the rest of the latty went under.

In phrases

creep the letty (v.)

(UK police/und.) to share a lodging-house room without paying .

[UK]P. Hoskins No Hiding Place! 189/2: Creep the letty. Share a room in a lodgings house without payment.