To pull a prank with extraordinary dedication. Named after Mary Toft, who stuck rabbit parts up her vagina and convinced English royal surgeons that she was giving birth to half-rabbits.

A Bloomer is someone with a bright outlook on life who is optimistic in nature. Bloomer's frolic in every opportunity to be happy and try to make the most out of life. The opposite of a Bloomer is a Doomer. The term Bloomer originated specifically as a counter to the Doomer on sites especially like 4Chan.