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1.
A mentally created condom used to help prevent the spread of MTDs (Mentally Transmitted Diseases). This is the only way to help prevent the spread of MTDs, the only thing that can make any sexual act involving the mind very dangerous. Mind condoms are mentally generated, and in no way reduce the pleasure of sexual activities involving the mind, other than the time it takes to mentally generate a mind condom. Mind condoms are generated by concentrating on their mind and nervous system being wrapped in rubber or a similar water proof substance. The more partners involved in a sexual mind act, the longer one will have to concentrate on creating a mind condom, in order to prevent the mind condom from failing. It is recommended that all partners involved in the mentally sexual act have a mind condom ready.
Don't be insane, cover your brain with a mind condom.
by Eddie the cool kid August 27, 2006
 
2.
When someone is attempting to penetrate you via mindfuck, and you need to protect yourself.
You should buy a value pack of pre-lubed mindcondoms before you watch Inception.
by Tpauk January 22, 2011