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.

Hemorrhoid like folds of tissue that hang from the anus caused by excessive fisting.

present tense: when a prairie dog is emerging from the butthole, and you eat that ass out.