A fork of Rural Dictionary
Man old enough to be a Grandpa, that has a new baby of his own.
Daryl is a Grandpa Daddy, he and his younger wife is having a baby.
the salutation used by a child that is the result of father/daughter incestual sex.
woman; "you'd better not let grandpa daddy know we've been having sex!"
tween; "ok mommy, but grandpa daddy told me the same thing too!"