expression
Western Japanese dialectal copula past tense, equivalent to standard だった. Also frequently used in anime and dubbed foreign media to characterize elderly speakers.
See also: だった
昔はここが畑じゃった。
Long ago, this was a field.
アニメでおじいさんが「わしは若いころ、強い侍じゃった」と言った。
In the anime, the old man said, 'When I was young, I was a strong samurai.'