Top Definition
When a younger person sexually identifies as an old person (e.g. grandparent)
Why does Suzy insist on using her handmade doilies as condoms and making her cats watch us fuck? She must be a gransexual!
by Justforkix April 12, 2016
A transexual grandparent.
Hate to break it to you, but your ambiguous grandmother is a total gransexual.
by harlan50 February 29, 2012
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