Why not call a spade a spade? Do not palliate sins by euphemisms.
“We call a nettle but a nettle, and the faults of fools but folly.” —
“I have learned to call wickedness by its own terms: a fig a fig, and a spade a spade.” —John Knox.
Spades in cards. A corruption of the Spanish spados, pikes or swords, called by the French piques (pikes).
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894
More on Spade from Infoplease: