“I write in vernacular in certain situations, but never formally. For instance, when using instant messenger type programs I’ll write “prolly” or “fixin’”.
Growing up in the south, “fixin’ to” was a way of life but I never saw “prolly” (or “praps”) until FR.
I often write in “Southern”, but always with proper punctuation. It can sometimes be quite the challenge to do so. It’ll give you more respect for how Samuel Clemmans was able to convey the venacular in his writings.
And for the record it’s y’all - not ya’ll or somethin’ else equally incorrect or ridiculous. The contraction is of “you all”.