Pizza sauce. Used for example in South Philadelphia at a philly cheese steak shop you get pizza sauce on the cheese steak but it is listed on the menu as red gravy.
(n.) A mixture of red sauce, (Spaghetti, Marinara, etc.) and period blood. Found primarily in African American culture. Red Gravy is used to put a spell on a man which keeps him from leaving the woman who gave him the Red Gravy.
she a crack ho but I can't leave her. tha bitch gayme da Red Gravy!