Top Definition
Being between 80 and 90 years of age.
My Great Grandfather is a dirty old Octogenarian.
"This Veteran is an Octogenarian."
by Brad Wells June 22, 2005
A place or location where one fights to the death by emasculation. The game consists of two opponents who must fight using only their hands, or in some situations are given weapons, until one loses their penis and are left to bleed out to death.
"Did you call my father a ... , that's it, this Friday night at the octogenarian!"

"I think I caught something off that broad at Harris', whatever it is - it stings as though I've been in an octogenarian!"
via giphy
by Haramarah July 23, 2016
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