caffeinated

Etymology

Back-formation from decaffeinated.

adj

1. Containing caffeine naturally (e.g., coffee, tea, and cacao) or as an additive (e.g., soft drinks, sports drinks, or energy drinks).
   But to address the question in theoretical terms, it turns out that yes, caffeinated soap might perk you up, but it would depend on how long you stayed in the shower, and how long you spent rubbing the soap against your skin. 2003-11-27, David Adam, “Can showering with caffeinated soap perk you up?”, in The Guardian
2. (informal, of a person) Overly peppy or energetic; stimulated by caffeine.
   For most of us, to be caffeinated to one degree or another has simply become baseline human consciousness. 2021-07-06, Michael Pollan, “The invisible addiction: is it time to give up caffeine?”, in The Guardian

verb

1. simple past and past participle of caffeinate