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Someone who's sexual nature and/or orientation changes. Someone who has more than one mode of sexual nature and/or orientation.
The person's morphasexual nature allowed zim to be straight at some times and gay at other times.
by Ophir September 04, 2005
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Someone that is so oversexed that they'll go either way just to get their rocks off, gay or straight.
That boy's nothing but a common morphasexual.
by Ferd Berfel November 03, 2003
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