pumped (up) - to be filled with enthusiasm or excitement

When you are "pumped up" you are ready and excited to do something. For example, "I am so pumped up for this race."

It comes from the feeling after lifting weights. Oftentimes, men feel their muscles swell after pumping iron - they feel pumped up. Technotronics popularized the phrase in 1990 with their song, Pump Up the Jam: Pump up the jam, pump it up While your feet are stompin' And the jam is pumpin' Look at here the crowd is jumpin' http://www.metrolyrics.com/pump-up-the-jam-lyrics-technotronic.html#ixzz20ejWospf