Definition of "lupper"
lupper1
lupper2
noun
countable and uncountable, plural luppers
(slang, humorous) A meal or snack eaten between the normal times for lunch and supper.
Quotations
All I wanted to do was get out of my wet clothes, catch a little lupper and get some much-needed rest. In case you don't know what lupper is, it's the same thing as brunch only later in the day. Lunch and supper combined equals lupper.
2012, R. M. Singhose, Living the Dream: Harley Woman: Tales from the Open Road, page 200