standing joke

There was in fact an "eternal fitness" in horse and man that was not exactly a "standing joke," but a peripatetic one.

Then they raised a horse laugh, and the cost of that hatchet became a standing joke and a slur on my "business ability."

Grandmother Sanford's pension had come to be a standing joke.

His complete ignorance of nautical matters became a standing joke.

The prowess of the British charioteers became a standing joke in Rome against the soldiers of Cæsar.