Scottish National Dictionary (1700–)
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First published 1971 (SND Vol. VIII).
This entry has not been updated since then but may contain minor corrections and revisions.
¶SMOIT, n. A person who talks in a silly obscene way (Gall. 1824 MacTaggart Gallov. Encycl. 428).
[Orig. doubtful. Poss. an arbitrary variant of Eng. smut, obscenity.]