half a shake of a lamb's tail

half a shake of a lamb's tail

A very short amount of time. Don't worry, I'll have that done in half a shake of a lamb's tail! I just need you to fill out this form—it should only take half a shake of a lamb's tail.
See also: half, of, shake, tail
Farlex Dictionary of Idioms.

two shakes of a lamb’s tail

mod. quickly; rapidly. I’ll be there in two shakes of a lamb’s tail.
See also: of, shake, tail, two
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • two shakes of a lamb’s tail
  • two shakes of a lamb's tail
  • on (one's) tail
  • on somebody's tail
  • on someone’s tail
  • on tail
  • on your tail
  • sit on (one's) tail
  • sit on someone's tail
  • turn tail