It's when you don't wipe your bum good enough after taking a poop. Your bum can get poo crusties and make your asshole itch.
I've got a bad case of butt rust this morning after all that drinking and pooping I did last night. Poop.
by MrRoche May 19, 2005
Get the butt rust mug.The off-brown discoloration inside the undershorts. Butt rust, also known as "skid mark" is usually the result of high pressure farting and / or lack of sufficient wiping of the anus.
by Frank Klaune March 5, 2004
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is when one neglects to clean or wipe properly betwixt their glute cheeks and a flaky orange/brown build up of poop deposit happens. Butt rust has been known to emit a foul odor of human fecal matter and cause extreme and even painful discomfort when walking, running and especially biking. Butt rust is not only a human malady but is most common in and among other bipedal or quadrupedal mammals whose legs come together near the exterior of the anus to form a crevice or fissure of the body perfect for the formation of said ailment. Butt dust can often be embarrassing as it can appear in your undergarments as skid marks, it can leave behind butt dust (see butt dust definition), or it can cause grief and later chafing when one is expecting to expect butt sex. The only sure fire ways to rid oneself of butt rust is to clean between the buttocks thoroughly and regularly and to perform extra in depth wipes after leaving a deposit in the porcelain pot.
"After not bathing for a few days I was washing my tush in the shower when I noticed the water turned an orange/brown color which must have been from my butt rust."
"I was going down on Tammy the other day when I accidentally licked her anus and she had butt rust there!!"
"I didn't know what to expect when having butt sex but I knew I needed to take care of my butt rust before the main event."
"I was going down on Tammy the other day when I accidentally licked her anus and she had butt rust there!!"
"I didn't know what to expect when having butt sex but I knew I needed to take care of my butt rust before the main event."
by butt_bot September 13, 2011
Get the butt rust mug.by sackcrusher9 October 11, 2006
Get the rusty brown button mug.A gay man's period.
Once a month, for usually 3-5 days, all gay men experience rustbutt, when the accumulated semen and blood from a month of butt sex is shed from the anal lining, and comes out as a rust-colored fluid.
Once a month, for usually 3-5 days, all gay men experience rustbutt, when the accumulated semen and blood from a month of butt sex is shed from the anal lining, and comes out as a rust-colored fluid.
by Rabbi Rusty December 18, 2015
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