Excited, energetic, or enthusiastic; also refers to muscles that are swollen from exercise or something inflated by a pump.
From 'pump' (Middle English 'pumpe') meaning to move fluid by mechanical action. The slang meaning 'excited' emerged in 1980s fitness culture when 'pumped up' described both muscular swelling and emotional excitement.
Arnold Schwarzenegger popularized saying 'pumped' in the 1970s bodybuilding scene, describing both the physical sensation of blood flowing into muscles and the mental high of intense training. The word jumped from gyms to general enthusiasm.
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