Open wounds in the skin. Usually gaping and the source of a nasty odor, they usually occur on or around the anus and buttox areas. See George W Olson for an example.
The rot that lives in George's gaping fissures forced me to sleep on the couch.
by Rob Kudla February 22, 2004
A cut inside your anus. A.K.A. "Butt hole cut"
"My anus is bleeding!!! Damn fissure!"
by clarkfisherismygslice November 06, 2007