souped-up

Short definition from Wiktionary

Adjective

1. 1
   Of a racehorse: injected with a substance to make it run faster or to change its temperament.
2. 2
   Of an engine, a motor vehicle, etc.: modified for higher performance.
3. 3
   Improved.
4. 4
   Intoxicated by alcohol or drugs.
5. 5
   Excited.

Verb

1. 1
   simple past and past participle of soup-up
2. 2
   simple past and past participle of soup up