'amped' originates from English, specifically the abbreviation 'amp' (short for 'amplifier' and related to 'amplify'), where 'ampli-' meant 'large' and Latin 'facere' meant 'to make'.

'amped' changed from the English word 'amplify'/'amplifier' which was shortened to 'amp'; the past participle/derived adjective 'amped' developed from that shortened form and later extended into slang meaning 'excited'.

Initially, it meant 'made louder' or 'increased in volume', but over time it evolved into its current slang meaning of 'very excited' or 'energized'.