pep (pěp) n. Energy and high spirits; vim: "The duchess is full of pep, that particularly American word that expresses precisely her energy and gaiety"(Suzy Menkes). tr.v.
pepped, pep·ping, peps To bring energy or liveliness to; invigorate: The good news pepped him up.
"vigor, energy," 1912, shortened form of pepper, which was used in the figurative sense of "spirit, energy," from at least 1847. Peppy "full of pep," first recorded 1922. Pep rally is attested from 1945; pep talk from 1926.