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When you take a shit and don't wipe and later that day you notice a crusted shit around your rectum resembling a Rusty Halo
Boy 1: Aww man I totally got a bad Rusty Halo
Boy 2: Dude you need to wipe!
by MorningThunder January 15, 2012
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2
A term for the Anus.

Origin : The Irish band "The Script" unwittingly coined the term after writing a song called "Rusty Halo". Shrewd listeners and Script critics decided that it was a song about buttholes
"Angel in the streets, lets me see her rusty halo in the sheets"
by Rustyhalo123 May 15, 2018
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