Ain't - (pronoun) A slang
compound word that usually is replaced
by the compound word "isn't" meaning "is not". Wether is a world is debateable, but if were to be a word, this would be the most correct
He isn't going to the store right now.
correct to say this)
He ain't going to the store right now.
(this isn't a correct word because usually a compound word takes out one letter on the word, ain't, if you tried to add a letter to ain't you more than likely wouldn't get anything. But ain't just seems to sound better in syntax.)