The Collaborative International Dictionary
Smuttiest
Smutty \Smut"ty\, a. [Compar. Smuttier; superl. Smuttiest.]
Soiled with smut; smutted.
Tainted with mildew; as, smutty corn.
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Obscene; not modest or pure; as, a smutty saying.
The smutty joke, ridiculously lewd.
--Smollett. [1913 Webster] -- Smut"ti*ly, adv. -- Smut"ti*ness, n.
Wiktionary
smuttiest
a. (en-superlativesmutty)