What is I Pulled A Boner?
1.
Around 1940 and after, "a boner" was a screw up or mistake. So, to "pull a boner" was to make a mistake. Don't say "I pulled a boner" to your Teacher or Boss or police. they'll punnish you for that. If you're brave, you could try it with anyone else.
Wife- why'd you eat my cake?? I was saving that!
husband- "sorry Dear. I pulled a boner."
See