SMUTTY
black, smutty
(adjective) soiled with dirt or soot; “with feet black from playing outdoors”; “his shirt was black within an hour”
cruddy, filthy, foul, nasty, smutty
(adjective) characterized by obscenity; “had a filthy mouth”; “foul language”; “smutty jokes”
Source: WordNet® 3.1
Etymology
Adjective
smutty (comparative smuttier, superlative smuttiest)
Soiled with smut; blackened, dirty.
Obscene, indecent.
• Episode 12, The Cyclops
Affected with the smut fungus.
Verb
smutty (third-person singular simple present smutties, present participle smuttying, simple past and past participle smuttied)
(transitive) To make dirty; to soil.
Source: Wiktionary
Smut"ty, a. [Compar. Smuttier; superl. Smuttiest.]
1. Soiled with smut; smutted.
2. Tainted with mildew; as, smutty corn.
3. Obscene; not modest or pure; as, a smutty saying.
The smutty joke, ridiculously lewd. Smollett.
– Smut"ti*ly, adv.
– Smut"ti*ness, n.
Source: Webster’s Unabridged Dictionary 1913 Edition