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literally a large sandwich is a refrence to the sitcom wings and at every event on nantucket they thought they had to get a "big sandwich" from a deli there.
helen says we should celebrate brian's engagement
lowell says I 'll go pick up a Big sandwich.
by slamming sammy May 14, 2009
A larger than normal sandwich
"Hey dude, that's a big sandwich!"
by PrimeX May 19, 2006