When you insert a funnel into a woman's vagina and pour an alcoholic beverage of your choice into the funnel, and you proceed to have her pee the booze back into your mouth.

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.