tweaked

adj

1. (slang)Hallucinating, especially under the influence of crystal meth or similar narcotics.
2. (figuratively, slang)Broken, messy, out of order.
3. (figuratively, slang)On edge, nervous, tense.

   “I don't know why, but Koops has been acting odd lately. What could be bothering him? Probably nothing. He's always tweaked about something.”

verb

1. (form-of, participle, past)simple past and past participle of tweak