You call a person shmerica that is blonde, doesn't stop talking when told, and is smart only when they need to be. They can come up with amazing come backs and people only wish they could think of.

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.