means to be under the influence of some drug; however, this word is sometimes used by some Zimbos in reference to being inebriated (with either wine, spirits, or beer) instead of being high from drugs although that's not what it really means.
Note: Generally if a person is self-aware about being high they might say something like "Amana, bhoizi dzangu ndakabatwa" as a signal that you shouldn't blow their high by asking them to do stuff with requires concentration or ask them mundane boring questions.
Synonyms for kubatwa
"Hona blaz avo, kubatwa ka uko. Dzakangotarisa madziro, hahaha... Inga ma1."