The Collaborative International Dictionary
lamb's tail
donkey's tail \donkey's tail\ n.
a Mexican plant ( Sedum morganianum) bearing small
rose-colored flowers; called also burro's tail, horse's
tail, and lamb's tail.
--RHUD
Usage examples of "lamb's tail".
In the shake of a dead lamb's tail they'd have that frame hanging from a scaffolding somewhere.
They mean the time for a shake of a lamb's tail - a technical joke, you see.