A baseball metaphor (along the lines of getting to the plate, to 1st base, to 2nd base... etceteria) for a member of the opposite sex that obviously desires coitus but will not make the first move. He/she is just sitting there and all you have to do is "make contact" and the deal is closed i.e. home run.

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.