Mythical or supposed hybid amphibious octopus with fur and a cat's head.
Horace, 1676; "I comme apon theyt Cactopus inne theyt wooden acrye, half inne-to brookye, tenntacyles waveyt."
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When a girl hasn't shaved her pubes in a short while and they end up stubby and spikey.
I picked up a girl last night and she had a cactopus. After some hot sex I looked down and I was bleeding excessively
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A person who only pranks someone out of spite
Brett is such a cactopus, he only pranks someone when heβs mad.