(slang) An alternate term used by grandmothers (especially mine) to curse in front of little children instead of saying 'Bull Shit'
Child: Grandma! I jumped over the roof!
Grandma: That's bologna sauce!
You make bologna sauce by mixing mayonnaise and lemon juice so that the mayonnaise curdles, and then blend the mix with some bologna in a blender. And there you go! You can use it for anything, as a soup, or a hamburger topping, or ice cream topping, or even by itself as a milkshake! Or use already rotten mayo for a tastier sauce. Oh and this is what Shiloh eats every morning.
"BOLOGNA SAUCE!!!!!!!"