When a member of the reptile species gets a boner in the water and tries to play it cool by laying in a plank-like fashion.

(Note: never insult a Southern Floridian Alligator with drift wood... you'll poke your eye out.)

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.