Wiktionary
n. 1 A special one-day sale during which retail goods are offered for one dollar or at very reduced prices. 2 (context slang by extension English) An occasion considered special or worth enjoying.
Usage examples of "dollar day".
He picks them up - there's four or five hundred dollars in all, which puts him on the way to a three-thousand-dollar day, not great for this time of year, but not bad, either - then rolls them up and slips a rubber band around them.
It was a Friday night, and the place was more crowded than Dollar Day in a cathouse.
Now Peewee lashed them firmly, still in front as my own bottles and the Mother Thing were on my back-no doubt she was finding it as crowded as Dollar Day.
I looked like what's left after Dollar Day is over, but Whipper Will assured me that nobody would notice.