Wiktionary
pep up
vb. To make stronger or more interesting
WordNet
Usage examples of "pep up".
He may solve the Mei-Ling Trujillo problem for us, and he and Sir Kevin may pep up the Crazy Eddie Squadron.
Does it pep up the efficiency, or just the speed -- combustion rate and exhaust velocity?
The new rockets--which I was flying on as navigator before I got sacked--use powdered aluminum in their fuel to pep up their lift-off.
He would have to disconnect all the Dimac circuits and pep up the old goodwill-to-mankind modules.
Oh, I suppose she was out to pep up her program, but that's beside the point.