They are eye-dialect spellings designed to make the ordinary way these phrases are spoken appear careless or substandard.

The link article begins

Eye dialect is the use of deliberately nonstandard spelling for standard pronunciation. The term was coined by George Philip Krapp to refer to a literary technique that implies the standard pronunciation of a given word that is not well-reflected by its standard spelling, such as wimmin to more accurately represent the typical English pronunciation of women. However, eye dialect is also commonly used to indicate that a character's speech is vernacular (nonstandard), foreign, or uneducated. This form of nonstandard spelling differs from others in that a difference in spelling does not indicate a difference in pronunciation of a word. That is, it is dialect to the eye, rather than to the ear.

They are eye-dialect spellings designed to make the ordinary way these phrases are spoken appear careless or substandard.

The linked article (from Wikipedia) begins

Eye dialect is the use of deliberately nonstandard spelling for standard pronunciation. The term was coined by George Philip Krapp to refer to a literary technique that implies the standard pronunciation of a given word that is not well-reflected by its standard spelling, such as wimmin to more accurately represent the typical English pronunciation of women. However, eye dialect is also commonly used to indicate that a character's speech is vernacular (nonstandard), foreign, or uneducated. This form of nonstandard spelling differs from others in that a difference in spelling does not indicate a difference in pronunciation of a word. That is, it is dialect to the eye, rather than to the ear.

They are eye-dialect spellings designed to make the ordinary way these phrases are spoken appear careless or substandard.

They are eye-dialect spellings designed to make the ordinary way these phrases are spoken appear careless or substandard.

The link article begins

Eye dialect is the use of deliberately nonstandard spelling for standard pronunciation. The term was coined by George Philip Krapp to refer to a literary technique that implies the standard pronunciation of a given word that is not well-reflected by its standard spelling, such as wimmin to more accurately represent the typical English pronunciation of women. However, eye dialect is also commonly used to indicate that a character's speech is vernacular (nonstandard), foreign, or uneducated. This form of nonstandard spelling differs from others in that a difference in spelling does not indicate a difference in pronunciation of a word. That is, it is dialect to the eye, rather than to the ear.