The back splash of pee or shit on the underside of the toilet seat.

A person who is the lowest of lows in your eyes. A shitty person who doesn't deserve your respect or time.
That crust cake is finally out of my life forever.
by truoodle November 13, 2020
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When you are a very crusty kid and you take a shower and get left out. Now you have rust in your crust.
Person one: Your crusty you should take a shower.
Crusty kid: yeah I should. After i'm going to play outside!
*later*
Crusty kid: Oh no now I have rust in my crust because I was out too long!
Person: Yikes! You should pour coke on that.
by ijgfiu davhaj February 25, 2019
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