Party Baby
Term given to children born in the Fall, usually around September. Usually implies what the parents were doing New Years.
Girl: Aw, what a great time to have a baby; Halloweens soon!
Guy: Yeah, she's a party baby.
Guy: Yeah, she's a party baby.
party the baby off
party hard and long and crazy
Fred: "What do you want to do tonight?"
Drew: "Party the baby off man"
Drew: "Party the baby off man"