Tipworld -> Origins
Skulduggery

(skull-DUG-uh-ree)
(n.) Trickery; dishonest or deceitful behavior

This word is sexier than you might think: Apparently it's an alteration of the Scots word "sculduddery," which means "fornication" or "obscenity."

(Come to think of it, even this word's spelling is tricky, considering that it's also correctly rendered as "skullduggery" or "sculduggery" or even "scullduggery.")

"Watergate was such a sensational piece of skulduggery."--the London Times