not know whether (one) is Arthur or Martha

To be in a state of confusion or chaos. Primarily heard in Australia. You can't have Miller take over the project—he doesn't know whether he's Arthur or Martha on the best of days! I have so many appointments today, I don't know whether I'm Arthur or Martha.

See also: know, not

See also:

between the jigs and the reels
reel
coming or going, not know if one is
in thunderation?
in (the) blazes?
be out of kilter
chop and change
in blue blazes
in tarnation?

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