all y'all's en · PRON
Meanings
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(Southern-US, colloquial, form-of, possessive) Possessive of all y'all (standing in for all your).
form of all y'all
"How all y'all's folks, Mis' Clark? How yo maw and paw? How Dan? ...
1946, Mary King O'Donnell, Those other people, page 24:And you know what's on the tip of all y'all's tongues? Each and every one of y'all?"
2008, Matt de la Peña, Mexican whiteboy, page 97: