1 definition by VENOM 647
The build up of brown malicious content in your underpants. Once the phenomena has grown bigger than your fist set your underpants down upon the radiator and let them dry. Soon you will be using your crust for many household tasks.
Guest: Hey this is some realy good cake, The chocholate sprinkles are fantastic.
You: LOL. Your Eating My Rusty Crusty.
You: LOL. Your Eating My Rusty Crusty.
by VENOM 647 January 12, 2009