it’s from parks and recreation, the characters donna & tom have an annual day where they treat themselves to various pampering and nice things.
the date wasn’t mentioned “in world”, but that episode aired on the 13th of october 2011, hence that day being picked as the official treat yourself day!
the vowels are different etc, but the tweet sets it up like it’s supposed to sound a li’l bit like “tossed salad and scrambled eggs”, which is part of the frasier theme tune.