Used as an interjection after a generally mundane accomplishment to make the accomplishment sound much more exciting/important.
I just remembered I have food in the fridge that might still be good! Booyah swag!
often used by cyborg from the teen titans
??:"we can watch your movie tonight"
cyborg:"booyah!!"
Booyah is a thick stew, believed to have originated in Belgium, and made throughout the Upper Midwestern United States.
My great grandfather used to make Booyah in the backyard for the whole family for dinner.