Refers to an individual of questionable intelligence. A stupid or slow-witted person. Like that of one who's head is misshapen or resembles a jackfruit (Artocarpus heterophyllus)
The motorist just sat there at the green-light like a jackfruit.
n. An exotic fruit scientifically known as Artocarpus heterophyllus indigenous the rain forests in the Western Ghats of India. Is also found in Brazil, Africa, and the Philippines. The fruit's interior consists of large edible bulbs of yellow, banana-flavored flesh that encloses a smooth, oval, light-brown seed.
I love jackfruits so much that my pancreasalmost exploded when I ate one, you jackfruit.