Sheepskin

·noun The skin of a sheep; or, leather prepared from it.

II. Sheepskin ·noun A diploma;

— so called because usually written or printed on parchment prepared from the skin of the sheep.

sheepskin
The parchment diploma received by students for taking their degree at college. In the back settlemen...

Dictionary of American Words And Phrases by John Russell Bartlett.
sheepskin fiddler
A drummer. ...

Dictionary of The Vulgar Tongue by Francis Grose