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Possibly Australian in origin. When someone has "shit on the liver" it usually means they are in a bad mood.
The old folk song "the cane-cutter's lament" has the term in its fourth stanza:
"The cane was bad the cutters were mad
The cook had shit on the liver
And I'll never cut cane for that bastard again
On the banks of the Barron River"
by Big Hugh Ness October 30, 2007