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1.
Someone who is, or is doing something like a Jigger. But the person isn't considered a Jigger.

Jiggerly shouldn't be used to describe something a Jigger does, because a Jigger's a Jigger. Anything a Jigger's doing, their automatically doing Jiggerly. So it'd be like saying something that's already understood, twice.
And that just gets annoying.
"I jiggerly walked over to the door"
by Omg... MARMALADE November 15, 2009