boner

/B OW1 N ER0/
noun
  1. 1

    An erect penis.

    โ€œWhy do guys get boners when they wake up in the morning?โ€

  2. 2

    One who or that which bones (removes bones).

  3. 3

    A blunder; a silly mistake.

    โ€œHe really pulled a boner that time!โ€

Source: https://en.wiktionary.org/wiki/boner