When you're having sexual intercourse with a girl from behind, you stop and as soon as she ask's why you stopped you hit her over the head with a pineapple.

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.