Top Definition
A sex fantasy or act you would actually do except that current circumstances prevent it.
My wife won't ask her hot friend to join us in a threesome, so it shall remain my cantasy.
by coconut2010 May 07, 2010
2 Words related to cantasy
Mutilation of the words "Can't" and "Fantasy".

Describes a fantasy that is just too plain weird for either party to fulfill.
girl: I will not participate in your sick Can'tasy!
by Clement Playford September 02, 2008

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