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Wiktionary
pep up

vb. To make stronger or more interesting

WordNet
pep up
  1. v. urge on or encourage especially by shouts; "The crowd cheered the demonstrating strikers" [syn: cheer, inspire, urge, barrack, urge on, exhort]

  2. e.g.,make more interesting or lively; "juice up a party"; "pep up your paper" [syn: jazz up, juice up, ginger up]

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.