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1.
The general state of mind characterized by complete ignorance about sex and human reproduction.
Dude they think that sex ed teaches us a heck of a lot of stuff we didn't know, but the truth is, we lost our mental virginity a while back.

Totally dude.

*high five
by Universe24 May 22, 2011
 
2.
The state of mind prior to having been mind fucked.
Ted: I lost my mental virginity after watching Shutter Island.

Nick: I lost my mental virginity after watching Human Centipede.

Tom: You guys are mind whores.
by Tedschloiter August 14, 2011