Spice Up Meaning

(idiomatic) To make more exotic, fun or extravagant.

Example: To enhance the flavor of something by adding spice to it.
January 2008, The Eagle-Tribune - Fresh or dried? Spice up your cooking with the right seasonings
1984, Rosemarie Tong - Women, Sex, and the Law page 39
  The good sister is there to minister to his spiritual needs, the nurse is there to bind his wounds, and the prostitute is there to spice up his bland sex life.