hayseed /ˈheɪˌsid/noun 3adjective 1forms 3 noun3 •Seeds from grass that has become hay. •A rustic person; a yokel or bumpkin. •Cruft from bits of hay that sticks to clothing, etc. adjective1 •Characteristic of or befitting a hayseed (person); rustic, uncultivated, backwater.The Corporation of Western Reserve University, with entire unanimity and ombliferous enthusiasm, made you to-day an LL. D. It is no small shakes of a hayseed College, I would have you know. — 1892 formshayseeds · more hayseed · most hayseed