A method of saying one has flatulated without offending geriatric ears. Similar to the Australian phrase of "opened your lunch." People no longer have to say "he farted."
Dude, who cracked a rat? Jimmie, do you need to go change your draws?
Ah man, I just cracked a rat so bad, it tweeked my seat!
When you fail at something in life (eg. failing an exam or not getting a job), go home and spend an hour just standing in the shower, propping yourself up against the wall with your eyes on your feet.
Caleb knew the only thing to do after he didnt get prefect was take a failure shower.