When swimming in an ocean or a body of water with shells in it, you go to change out of your swimming suit and shells pour all over the floor and are stuck up in your ass.
After I swam in the Atlantic Ocean, I went home to take a shower and I had some serious Shell Crack!
by Kaneloke October 17, 2007
To snap, or instantly be angered insuch short of a time,later on forgetting what it's about and the damage set in before you know what is going on.
Hey dude, that was the same guy that crack-shelled yesterday and now he's acting like nothing happened at all.
by DakineWordGuru April 20, 2011