to drink alcohol, especially in company or as a frequent practice; to drink 'nobblers' ...1847 obs. Aust. sl.
from nobbler (n. a small quantity of alcoholic drink) + -ize
FIRST DOCUMENTED USE
1847 - see EXAMPLE below
"...Yesterday a woman named Maria King alias Sullivan, was brought before the Mayor's Court, charged with having made rather free with the pockets of a man of the name of John Coombes, whilst he was comfortably nobblerizing in the William Tell, on Monday evening..."
From: The Port Phillip Gazette
Wed 30 June 1847, Page 2 - Domestic Intelligence, "A Light-Fingered Lady"