Rusty Halo 

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!

Rusty Halo by MorningThunder January 28, 2012

Rusty halo 

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"

Rusty halo by Rustyhalo123 May 15, 2018