"Uncle Buck assists at Charles Bon's funeral, helping to carry the coffin from the house to the gravesite. He gives the rebel yell (the Confederate battle cry) in lieu of the Catholic ceremonial, the words of which none of the funeral party know."
Critical Companion to William Faulkner (A.N. Fargnoli, M. Golay, R.W. Hamblin), 2008.
The rebel yell : ici