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3.
Caused by the stuffing of bananas up the anus.

Often experienced by veteran porn actors. e.g. Bree Olsen, Carmella Bing, Gianna Michaels, Flower Tucci.
Bill: 'Arghhh, too many bananas'. FISSURE!

Alana: 'hehehehhe'
by yokel of Melbourne August 30, 2008
 
1.
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
 
2.
A cut inside your anus. A.K.A. "Butt hole cut"

"My anus is bleeding!!! Damn fissure!"
by clarkfisherismygslice November 06, 2007