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.
1 shroomillion would be equivalent to 1,000,000×16,000,000,000. A single mature shroom can drop up to as many as 16 billion spores. So 1 shroomillion = 16,000,000,000,000,000