anal prolapse
When the rectum protrudes from the anal cavity. This can either be a result of sodomy or over exerting one's self while defacating.
Example:
Did you see that red blob come out of that chicks ass while she was shitting on his face?!?!? She's got an anal prolapse.
Did you see that red blob come out of that chicks ass while she was shitting on his face?!?!? She's got an anal prolapse.