Continuity mistake: Stack is driving Sammie to Clarksdale to get Delta Slim. During their conversation, in particular when they talk about the twins' father, the natural light keeps changing very noticeably between shots. (00:20:20)
Continuity mistake: When Smoke shoots the thief in the buttocks, the light on the road changes between shots. (00:16:30)
Other mistake: Smoke just arrived in town and parked the truck. He turns to his left, checking behind the truck. But what we see, as it turns out later, is directly to the left of the truck instead. Then he checks ahead, where it should be left of the truck. But the POV we get is again at an incongruous angle; it's what one would see being way to the right of the truck, looking towards it (as you can infer from the sign of the cafe that is exactly the one the truck is parked in front of). (00:13:50)
Continuity mistake: When the twins hug before splitting up to cover more ground to prepare for the big opening, the position of their bodies during the hug does not match between shots. (00:13:00)
Continuity mistake: In the snake-stabbing scene, Smoke's grip on the knife changes as the camera cuts. (00:11:45)
Continuity mistake: Look, when Sammie hugs his father in church at the beginning of the movie, before the pastor says, "I want you to swear to me," you can see Sammie lower his hand, the remains of the guitar dropping low behind his back. But in the next shot, the guitar is still held high. (00:03:00)
Other mistake: At the beginning of the movie, Ruth shouts Sammie's name. The pastor, who is on the left side of the pulpit, tells her, "Ruth, no, no," and only then waves him in, saying, "Come on, son." At the end of the movie, he does not address her, moves his body differently and waves, saying just, "Come, son." (00:02:25 - 01:59:10)
Audio problem: When Sammie's mom shouts his name at the very beginning of the movie, her lips don't move. (00:02:25)
Continuity mistake: When Sammie opens the church doors at the beginning of the movie, the elderly woman on the left side of the aisle is looking straight ahead, but in the reverse shot, she is already turned towards him. The same scene is shown again at the end of the movie, and this time you can see what would be an intermediate shot when the lady turns. However, the first time around, there is diegetic music that would require the shots to be consecutive, while the second time around, it's a montage with a rock song. (00:02:20)
Answer: Only that it's possibly derived from the Dutch word, "Kusse." It's no different from the rap stars of today using vulgar and racist language in their song lyrics.