Samuel Pepys, n. — Green’s Dictionary of Slang

Samuel Pepys n.

also Sam Pepys

[rhy. sl. = SE creeps; ult. British diarist Samuel Pepys (1633–1703)]

a sense of uneasiness or distaste, a nervous feeling.

1985		Wheeler & Broadhead Upper Class Rhy. Sl. 15: That priest hole gave me the Sam Pepys.
1998		R. Puxley Fresh Rabbit.