Share how much you mean to your grandfather with our Grandpa Definition Box Sign! A great gift for milestone birthdays or Father’s Day, this freestanding box sign has a black edge and a light, ivory finish. The humorous and heartfelt definition reads: “Grandpa (Noun). 1. a vintage little boy; 2. the one who is always hollering for Grandma; 3. telling stories and spoiling are his thing; 4. what love looks like. It measures 6" square by 1.5" deep.