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1.
To cause rejection by women, to cause to be unattractive to women or to ruin one's chances with a woman.
I was talking to three hot blonds by the bar and John walks in and shows them my skid marked boxers, completely deasifing me.

He deasified me by telling the girls in the class about my webbed feet.
by Mr. Flibble2 December 15, 2009