Boner
/ˈboʊ.nɚ/noun
An erection; also, a foolish mistake.
Did you know?The sexual sense is modern American slang, while the “mistake” sense is older schoolboy slang, so the word’s history is more awkward than occult.
Etymological Timeline
Old English
OE
bān
“bone”
Middle English
ME
bon
“bone”
19th Century
English
bone
“to make a mistake; blunder (slang)”
Early 20th Century
English
boner
“a foolish mistake (slang)”
Mid 20th Century
English
boner
“an erection (slang)”