Scottish National Dictionary (1700–)
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First published 1941 (SND Vol. II).
This entry has not been updated since then but may contain minor corrections and revisions.
BOBSUM. A nonsense word.ne.Sc. 1881 W. Gregor Folk-Lore of N.-E. Scot. 172:
Anerie, twaarie, tickrie, ten, Epsom, bobsum, gentle men, Pim, pam, whisky dam, Feedlum, fidlum, twenty-one.