米紙ワシントン・ポスト「鳩山首相に使ったルーピーって言葉は、『愚か』って意味じゃない」【働くモノニュース : 人生VIP職人ブログwww】

After discussion with several experts -- actually, reporter colleagues who sit within a 30-foot 
radius -- the consensus is that the term essentially refers to someone oddly detached from reality. 
For example, almost anything former senator John Edwards (D-N.C.) has said since he acknowledged 
his "love child" last year with a woman called the "campaign videographer" would probably qualify 
as loopy.