Absolute rubbish.
The phrase was introduced to English in 1542 in Nicolas Udall's translation of Erasmus, Apophthegmes, that is to saie, prompte saiynges. First gathered by Erasmus:
"Philippus aunswered, that the Macedonians wer feloes of no fyne witte in their termes but altogether grosse, clubbyshe, and rusticall, as they whiche had not the witte to calle a spade by any other name then a spade."
The phrase predates the use of the word "spade" as an ethnic slur against African-Americans, which was not recorded until 1928; however, in contemporary U.S. society, the idiom is often avoided due to potential confusion with the slur - i.e. Political Correctness.
http://en.wikipedia.org/wiki/To_call_a_spade_a_spade
Bookmarks