I. noun short for amplifier. II. verb — [with obj.] 1. (often amp something up) — play (music) through electric amplification • their willingness to amp up traditional songs virtually began the folk-rock genre.
2. (as adj. amped or amped up) —
‹informal› full of nervous energy, especially through taking amphetamines or similar drugs.
• I’ve got all this manic energy. I feel amped.