Someone who is actually normal and lets it crust after dropping a deuce. Basicallly, they NEVER wipe. sure it starts to itch and it builds up over time, leaving stains on your u derweat, but thats just proof that you're a crust king.
Person 1: Yo, are you a CrustKing or a Wiping Weirdo?
Crust is a term/slang that is used when something or a person is bad. Think of an soup that was left over 165 million years ago, when dinosaurs existed. Now imagine how that soup would be like. Lots of mold inside it, crust inside it, really disgusting orange and yellow stuff in the pan sticked to the pan. That's crust.
Here is some examples of how crust is used:
Hey man, you really have crust!
I don't like that game. That game has crust!
Alex, you got crust!