1) Isnt 2) Slang 
Ain`t is a contraction for am not, is not, are not, has not, and have not in the common English language vernacular. In some dialects ain`t is also used as a contraction of do not, does not, and did not. The development of ain`t for the various forms of to be not, to have not, and to do not occurred independently, at different times. The usage ......
Ain't A contraction for are not and am not ; also used for is not . [ Colloq. or illiterate speech]. See An't . 
am not
am not; are not; is not. · have not; has not; do not; does not; did not.