Scottish National Dictionary (1700–)
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First published 1974 (SND Vol. IX).
This entry has not been updated since then but may contain minor corrections and revisions.
-US, suff. Also -as, -is. A suffix added to n., v., and adj. stems, applied to persons, gen. with slightly disparaging force, connoting smallness, dullness or stupidity. See Dockus, Docus, Dummas, Gawpus, Gluffus, Govus, Gruffus, Gumpus, luckiedaicus s.v. Luckie, Pilliedacus, Rawnis, snackus s.v. Snack, n.1, etc.
[Poss. jocularly from Lat. -us suff. of masc. nouns.]