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1.
The cold hard glare and general shifty-eyed mannerisms of one who has been behind bars.
"Watch that guy, he's got some crazy Prison Eyes"
by Tickles August 25, 2006
 
2.
the phenomenon of someone appearing more attractive to you than they actually are due to a restrictive sexual scenario.

See also: camp eyes, construction site eyes
she doesn't look half bad through prison eyes. (camp eyes/contruction site eyes)
by joshua edison December 30, 2010