"blunder," 1912, baseball slang, probably from bonehead. Meaning "erect penis" is 1950s, from earlier bone-on (1940s), probably a variation (with connecting notion of "hardness") of hard-on (1893).
双语例句
1. Who was rubbing himself against me, with a boner in his pants?
是谁用他裤子里那东西在我身上磨来磨去?
来自电影对白
2. She made a classic boner and married a crook.
她犯了一个大错误,嫁给了一个骗子.
来自互联网
3. Christie Boner : Well, I saw the backseat.
克里斯蒂: 对, 我看到了后座.
来自互联网
4. Fogell : I have a boner!
弗盖尔: 我犯了个大错!
来自互联网
5. DJ squirms and moans while Hayden slams his tight ass with his bare boner.