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.
¶SMIRN, n. “A smug, officious person, especially one of insignificant appearance” (Rxb. 1923 Watson W.-B.).
[Orig. doubtful. Phs. an extended usage of smirrin, Smirr, a drizzle, sc. something slightly annoying but of no substance or importance. Cf. sim. metaphor in mod. Eng. slang shower.]