Someone who harvests wheat with a combine. Generally a young male who only has time to drink, smoke, chew, work, and occasionally knock up a midwestern girl. Travels the Midwest up to Canada every summer. You can find them in any small town bar in the midwest during the harvest season. They can be spotted by the pliers they wear on their belts.
Look at dem thur Canadian wheatwackers outdrinkin us and stealing our women.