Scottish National Dictionary (1700–)
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First published 1965 (SND Vol. VI).
This entry has not been updated since then but may contain minor corrections and revisions.
MORTAGIOUS, adj. Very drunk (Fif. 1912 D. Rorie Mining Folk 406). See Miraculous, and Mortal, I., 3. and cf. Eng. dial. mortacious, very, exceedingly.
[A jocular conflation of mortal + contagious or some sim. word.]