When a person does not wipe there ass well after taking a shit. This either results in a rash or you will end itching you ass crack for hours.
friend: Why you wigglin on the couch?
you: Man Ive got some crazy rusty butt.
by Bro000 March 6, 2009
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When you put it in someone's butthole and pullout and they proceed to do a line of cocaine off of your shit covered dick
Guy: hey I heard you hooked up with Katie d

Me: yeah we did a rusty coke butt
by Lojoooo June 24, 2017
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