A tomato sauce, usually made from scratch and paired with some sort of meat. Italian Grandmothers often make this sauce on Sundays, then have their behemoth of a family over for dinner. Some say it’s the best meal on the planet.
Tony: “Ah you going to Nonnas for Sunday Sauce tuhnight?”
Mario: “Nah I gotta wuhk”
Tony: “WHADDYA MEAN!?!
Mario: “EHH FUHGET ABOUT IT”
The action of taking Xanax on the day of Sunday in order to get "saucy." The goal is not to get fucked up, but instead to mellow out and relax in preparation for the oncoming week.
"Hey Dan, wanna go to the gametonight?"
"I can't. It's Saucy Sunday, so I can't really be seen in public."