The little round fecal pellets of animal droppings such as sheep, that have the appearance of a berry lying in grass or still hanging from or in the vicinity of the woollen backsides they emanated from.
Clueless person: Oooh look I found some magic berries in the long grass in yonder field... they don't taste as good as they look.
Farmer: Yep ye found some dingleberries from m' dingleberry field. I hope ye closed the gate or all m' sheep will scarper.
"Ladies and gentlemen, dingleberries on parade." (said by Jeff Conaway as Kenickie Murdoch in the 1978 romantic movie musical "Grease", while some athletes are running laps at Rydell High School's sports field).