Scottish National Dictionary (1700–)
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First published 1976 (SND Vol. X).
This entry has not been updated since then but may contain minor corrections and revisions.
WIZZY, n. In phr. to do a wizzy, to make water, urinate (in juvenile usage) (Edb. 1974).Edb. 1949 F. Urquhart The Ferret i. i.:
Take Jenny to the lavvy, will you? She wants to do a wizzy.