Dual-tense contraction of “wasn’t,” “ain’t,” the latter of which acting as a phonetically -friendly substitute of “isn’t.” Because “wain’t” includes a contraction for both the present and past tense, it is applicable to negative scenarios in both tenses.
Animal testing wasn’t ok then, and it isn’t/ain’t ok now. // Animal testing wain’t ok.
Past tense of "ain't"
A verb using contractions of "was" and "not", also "were" and "not".
Used to state a form of being in the negative and past tense.
Archaic or anachronistic southern slang
"It ain't right Cletus, he wain't there when I's came."
Or
"If wain't for dat horse, I's gone to the college."
(using above contractions respectively)