As explained by the world's foremost perversion afficianado, John Waters, in the director's commentary for "A Dirty Shame", blossoms are the result of having been anally fisted so much that your colon and other internal organs protrude from your sphincter.
I really enjoyed and miss the NBC sitcom "Blossom".
Hemorrhoid like folds of tissue that hang from the anus caused by excessive fisting.
1. Ever since Johnny got double fisted his blossoms are huge.
2. Johnny's blossoms are so beautiful we had a portrait made of them. That's it hanging over the fireplace.