Q: "oil the dog's wig"?

[Joel S. Berson]

Is this of any interest, and how is it explained?

In the 1784 _The Whimsical Jester: or, Rochester in High Glee_, there
is a bit on jargon that allegedly "flew about" on the occasion of a
boxing-match.  One item is from the barber's speech:  "oil the dog's
wig for him".

Joel

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