Scottish National Dictionary (1700–)
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First published 2005 (SND, online supplement).
This entry has not been updated since then but may contain minor corrections and revisions.
OSCAR SLATER, adv. [Rhyming slang for 'later'; Oscar Slater was wrongly convicted of murder in Glasgow in 1909.] Later. Also in reduced form Oscar.Gsw. 1985 Michael Munro The Patter 81:
Oscar Slater Later, as in 'See you Oscar Slater.' The man in question was involved in a famous Glasgow murder case.Gsw. 1990:
Ah'll see ye oscar.