Prilosta Share definition Flag 1a. Spoiled or rotten, usually used to describe items of food that are past date of expiration. The ham was quite prilosta, thus it was a meatylosta. Prilosta food can lead to severe burley-loo. Prilosta by Malchik1 April 20, 2007 0 0 Get merch Get the Prilosta mug. Buy Now — $32.95 See more merch