On one level, "tasty mojo" refers to a particularly scrumptious meal or satisfying beverage. More generally, it is a colloquial phrase used to describe a supremely pleasant outcome or quality. Mojo refers to the power of luck; making it "tasty" is next-level good fortune.
"Darling, this spaghetti dinner is some tasty mojo."
"Dude, I can't believe you won the lottery - you've got some tasty mojo!"