Green’s Dictionary of Slang

1. pornographic; thus smuttiness n.

1683		W. Kennett (trans.) Erasmus Witt against Wisdom (1509) 44: [S]ome wrinkled old women, whose very looks are a sufficient antidote to leachery [...] alway stand a tricking up themselves at their Looking glass, go naked neck'd, bare brested, be tickled at a smutty Jest.
1698		J. Collier Profanesse and Immorality of the Stage (1730) 4: Smuttinesse is a Fault in Behaviour as well.
1708		True Characters of A Deceitful Petty-Fogger et al. 7: Alone, she’s as Gamesome as a little Cat in a Corner, and will Tee-Hee at a Smutty Jest and be as Brisk and Obliging as the Rankest sinner.
1739		R. Bull Grobianus 13: If you yourself no smutty Jokes advance, It looks as you were bred in Ignorance.
1823		Bell’s Life in London 2 Feb. 1/3: Beef-witted country parsons (for the sake of chuckling over a smutty joke) may [do].
1841		‘I Am A Smutty Chimney Sweep’ in Gentleman’s Spicey Songster 24: O yes, I loves a bit of smut, / Which all the world now plainly knows.
1911		Day Book (Chicago) 18 Dec. 10/2: The way to treat smutty plays is to have them all produced in one theater and bar young people.
1915		Hull Dly Mail 13 May 4/8: The premeditated wantoness of the smutty line — how intensely degrading.
1931		Irwin Amer. Tramp and Und. Sl. 174: Smuts.–Obscene pictures or postcards. Smutty pictures or literature as peddled by fakirs or tramps.
1949		Hull Dly Mail (Yorks.) 25 Nov. 1/6: A mother was [...] keping her child off school [...] because she said she heard ’smutty stories’ there.

2. of a person, black; also used as n. see cite 1831.

1831		Morn. Chron. (London) 6 June 1/5: [US source] There was a wee bit of a piccanniny — a half-and-half — aboard with his mother [...] young smutty would be a little rough now and then.
1840		Flash Mirror 16: [of a chimneysweep] You must mind or else you’ll be tuck’d up at another halter afore long, my smutty one.
1875		Chelmsford Chron. (Essex) 24 Dec. 7/5: Doubtless the smutty chieftain never anticipated we were armed [...] I took deadly aim at his broad black chest.
1882		Dundee Courier (Scot.) 30 June 7/6: Where’ve you left your smutty moll?
1882		Cornishman 9 Mar. 7/5: Several young men were having a chat [...] one said ‘Here they have a new name for the devil [...] it’s ‘Old Smutty Face.’ At that moment the black man [...] happened to pass by [and] asked them ‘who were they calling smutty face?’.