To increase or enhance one's excitement, interest, energy, or alertness. The show was going really poorly until the host came out and pepped the audience up. I think I need some coffee to pep me up.

To make something more interesting, engaging, or exciting. I always use some red chilies to pep up my soups and stews. Have you considered using electric guitars to pep the song up a bit?

Stimulated; made to be or feel more awake, alert, and energetic. Hyphenated if used before a noun. I just can't focus until I get pepped up with a bit of coffee in the morning. The officer suspected that the pepped-up truck driver might have been high on amphetamines.