Boner

Noun

 * 1) lit.  Who or which bones (removes bones).
 * 2)  An erect penis.
 * 3)  A blunder; a bad mistake; a silly or stupid mistake.

Synonyms

 * erection, hard-on, stiffy
 * See Thesaurus:erection
 * blooper, blunder

Related terms

 * boney
 * boning knife