Cletus is the local hillbilly character from the Simpsons, often being a parody of every stereotype from the South.
He often appeared in scenes on the side. Often doing blue collar jobs, or buying stuff for his family that's far below par.
I really don't want to know everything about his girlfriend/wife Brandine and their relationship.
My favorite memory of Cletus was when Marge came by her Pretzel Wagon, and he had coupons for 300 free pretzels. Then he brings out his 44 kids and calls them all out by name.