When something that is already ripped up is ripped into smaller pieces. The result is lots of very small pieces that are impossible to put back together.
Mary: Did you get rid of the note we were passing in english class? I don't want John and David to find it again.
Jane: No worries, I ripped it to shredicles.
John: Yo dude, I found Mary and Jane's note from english class but they ripped it to shredicles so we can't put it back together again!
David: Aw man that sucks.
When conditions and elements for a sporting activity align to become irresistible, making it incredibly necessary for one to drop every responsibility and obligation in order to recreate.
Shredding weather. Weather conducive to shredding one's face off. Preferably on a board but skates, skis, and other shredable items will suffice. Activity dependent. For instance, Surfing shreather would be warm and still air with big swells. Skateboarding shreather would be moderately cool. Snowboarding shreather would be light snow.