1 definition by 56B415145161566825181747=4
The person invited to parties who's only purpose is to keep the group from getting into too much trouble. They usually don't get intoxicated as it would impare their parental judgement.
John: "Hey, I'm throwing a party this weekend. Should I invite Rob?"
Susan: "Definitely. We need a party dad".
Susan: "Definitely. We need a party dad".
by 56B415145161566825181747=4 October 26, 2016