Expression commonly used immediately after a gigantic monster growls before attempting to kill you.

The phrase should only be used if you are in possesion of a large weapon of suffcient power to exterminate the creature in question.

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.