I remember being on a cub scout camping trip and while our group was on a hike, we passed a little creek and there was some kind of foam building up at a spot where the water narrowed and got agitated around and some kid just yells “ew is that deer cum?” A few of us (myself included) laughed and some of the other kids were like “what is cum?” Which just made us laugh even harder while the adults tried to just get everyone moving again.