Refers to a member of the opposite sex who, although acceptable for a one-night stand, is not worthy of being taken out to dinner or meeting your family.
Erik: Why didn't you get that bartender's digits? Take her out some time.
B-Rad: Oh her? That Ain't No Dinner Thing.
B-Rad: Oh her? That Ain't No Dinner Thing.
by MellionBob January 14, 2009