The worst kind of Douche bag there is. A "Done That" pretends like he knows everything about everything hence the (Done That) but will also agree with whatever you say. Most "Done That's" are actually retarded but have surrounded themselves with other retarded people so nobody has ever actually discovered it. Done That's have been know to molest their sisters and therefor continue the line of Done That's.

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.