The castaway is where you take the "turd on a raft" (a turd on several layers of toilet paper floating in the toilet) one step farther by pooping onesingle,round,"Bridge Mix turd to represent Wilson. Inspired by the Tom Hanks Movie Castaway
When you feel like your soul is casting away during the middle of a double maths session or fucking spanish sessions. Sometime when you have a light boner for no reason and you start massaging it with nothing on your mind.
Bro my My soul is literal fucking Castaway, I'm gonna KMS cus this spanish lesson is SHIT