A slang term usually uttered by rednecks that literally means " That will teach him", or "that should teach him a lesson". Its a contraction of the grammatically incorrect phrase "that will learn him".
Somebody at work keeps stealing my lunch, so today i brought in a bowl of spit-snot-soup. That'll learn'em to take things that don't belong to him.
by Mingus Jenkins March 11, 2011