Energy and high spirits; vim: "The duchess is full of pep, that particularly American word that expresses precisely her energy and gaiety” ( Suzy Menkes).
To bring energy or liveliness to; invigorate: The good news pepped him up.
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.