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harum-scarum, disorderly ...1727-8 obs.
1. unintelligible language, gibberish ...1600 obs.
2. copulation ...M18 sl.
3. a wordy and mutual recrimination; a noisy argument ...L18 sl.
a rhyming combination, perhaps suggested by rant (vb.)
1600 - The First and Second Partes of King Edward the Fourth, Thomas Heywood;
precise sense not clear; see below from E-NED:
From: The Autobiography and Correspondence of Mary Granville, Mrs. Delany.
Edited by the Right Honourable Lady Llanover
Volume I. 1861
Mrs. Pendarves to Mrs. Ann Granville, Somerset House, 14 March, 1727-8