‘‘Hikikomori,’’ a word that has come into common usage in Japan in recent years to signify the abnormal avoidance of social contact, especially by adolescent males, has found its way into the third edition of the Oxford Dictionary of English published Thursday. The word is one of more than 2,000 new entries in the dictionary, whose first edition was published in 1998, according to Oxford University Press, the dictionary’s publisher.

The vuvuzela, the plastic horn used to cheer teams during the soccer World Cup in South Africa earlier this year, also won an entry in the latest edition. Other new entries include ‘‘bromance,’’ a close but non-sexual relationship between two or more men, and ‘‘staycation,’’ a holiday or holidays spent in one’s home country without going abroad.

The second edition of the dictionary added such Japanese words as ‘‘otaku,’’ meaning fanboy or geekhead, and ‘‘karoshi’’ for death from overwork.

That, and there isn't really a translation for it.

Go ahead, use bromance on your Master Thesis on British Literature.
Whoops, you f*** up your chance to get an M.A.